258212761 has 3 divisors (see below), whose sum is σ = 258228831. Its totient is φ = 258196692.

The previous prime is 258212737. The next prime is 258212771. The reversal of 258212761 is 167212852.

It is a happy number.

The square root of 258212761 is 16069.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 66113161 + 192099600 = 8131^2 + 13860^2 .

It is not a de Polignac number, because 258212761 - 2⁹ = 258212249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (258212771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 8035 + ... + 24103.

It is an arithmetic number, because the mean of its divisors is an integer number (86076277).

Almost surely, 2^258212761 is an apocalyptic number.

258212761 is the 16069-th square number.

258212761 is the 8035-th centered octagonal number.

It is an amenable number.

258212761 is a deficient number, since it is larger than the sum of its proper divisors (16070).

258212761 is an frugal number, since it uses more digits than its factorization.

258212761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32138 (or 16069 counting only the distinct ones).

The product of its digits is 13440, while the sum is 34.

The cubic root of 258212761 is about 636.7846224194.

Subtracting from 258212761 its reverse (167212852), we obtain a palindrome (90999909).

It can be divided in two parts, 25821 and 2761, that added together give a palindrome (28582).

The spelling of 258212761 in words is "two hundred fifty-eight million, two hundred twelve thousand, seven hundred sixty-one".