657126431 has 4 divisors (see below), whose sum is σ = 707674632. Its totient is φ = 606578232.

The previous prime is 657126397. The next prime is 657126443. The reversal of 657126431 is 134621756.

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

It is a de Polignac number, because none of the positive numbers 2^k-657126431 is a prime.

It is a super-2 number, since 2×657126431² = 863630292637595522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 657126391 and 657126400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (657126451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25274081 + ... + 25274106.

It is an arithmetic number, because the mean of its divisors is an integer number (176918658).

Almost surely, 2^657126431 is an apocalyptic number.

657126431 is a deficient number, since it is larger than the sum of its proper divisors (50548201).

657126431 is a wasteful number, since it uses less digits than its factorization.

657126431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50548200.

The product of its digits is 30240, while the sum is 35.

The square root of 657126431 is about 25634.4773888605. The cubic root of 657126431 is about 869.3933459582.

The spelling of 657126431 in words is "six hundred fifty-seven million, one hundred twenty-six thousand, four hundred thirty-one".