258041821 has 4 divisors (see below), whose sum is σ = 258209532. Its totient is φ = 257874112.

The previous prime is 258041813. The next prime is 258041837. The reversal of 258041821 is 128140852.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 87216921 + 170824900 = 9339^2 + 13070^2 .

It is a cyclic number.

It is not a de Polignac number, because 258041821 - 2³ = 258041813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (258041801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81526 + ... + 84631.

It is an arithmetic number, because the mean of its divisors is an integer number (64552383).

Almost surely, 2^258041821 is an apocalyptic number.

It is an amenable number.

258041821 is a deficient number, since it is larger than the sum of its proper divisors (167711).

258041821 is a wasteful number, since it uses less digits than its factorization.

258041821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167710.

The product of its (nonzero) digits is 5120, while the sum is 31.

The square root of 258041821 is about 16063.6801823243. The cubic root of 258041821 is about 636.6440716681.

The spelling of 258041821 in words is "two hundred fifty-eight million, forty-one thousand, eight hundred twenty-one".