658281649 has 3 divisors (see below), whose sum is σ = 658307307. Its totient is φ = 658255992.

The previous prime is 658281601. The next prime is 658281653. The reversal of 658281649 is 946182856.

The square root of 658281649 is 25657.

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

658281649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 198951025 + 459330624 = 14105^2 + 21432^2 .

It is not a de Polignac number, because 658281649 - 2²¹ = 656184497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (658281149) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 12829 + ... + 38485.

It is an arithmetic number, because the mean of its divisors is an integer number (219435769).

Almost surely, 2^658281649 is an apocalyptic number.

658281649 is the 25657-th square number.

658281649 is the 12829-th centered octagonal number.

It is an amenable number.

658281649 is a deficient number, since it is larger than the sum of its proper divisors (25658).

658281649 is an frugal number, since it uses more digits than its factorization.

658281649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51314 (or 25657 counting only the distinct ones).

The product of its digits is 829440, while the sum is 49.

The cubic root of 658281649 is about 869.9025076820.

Multiplying 658281649 by its sum of digits (49), we get a square (32255800801 = 179599²).

The spelling of 658281649 in words is "six hundred fifty-eight million, two hundred eighty-one thousand, six hundred forty-nine".