657492961 has 4 divisors (see below), whose sum is σ = 659055124. Its totient is φ = 655930800.

The previous prime is 657492911. The next prime is 657493007. The reversal of 657492961 is 169294756.

It is a happy number.

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 235806736 + 421686225 = 15356^2 + 20535^2 .

It is a cyclic number.

It is not a de Polignac number, because 657492961 - 2¹⁷ = 657361889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (657492911) 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, 780450 + ... + 781291.

It is an arithmetic number, because the mean of its divisors is an integer number (164763781).

Almost surely, 2^657492961 is an apocalyptic number.

It is an amenable number.

657492961 is a deficient number, since it is larger than the sum of its proper divisors (1562163).

657492961 is a wasteful number, since it uses less digits than its factorization.

657492961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1562162.

The product of its digits is 816480, while the sum is 49.

The square root of 657492961 is about 25641.6255529949. The cubic root of 657492961 is about 869.5549584473.

The spelling of 657492961 in words is "six hundred fifty-seven million, four hundred ninety-two thousand, nine hundred sixty-one".