657201231 has 12 divisors (see below), whose sum is σ = 950620320. Its totient is φ = 437520480.

The previous prime is 657201229. The next prime is 657201257. The reversal of 657201231 is 132102756.

It is a happy number.

657201231 is a `hidden beast` number, since 657 + 2 + 0 + 1 + 2 + 3 + 1 = 666.

It is not a de Polignac number, because 657201231 - 2¹ = 657201229 is a prime.

It is a super-2 number, since 2×657201231² = 863826916055830722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 657201195 and 657201204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (657201211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44310 + ... + 57251.

It is an arithmetic number, because the mean of its divisors is an integer number (79218360).

Almost surely, 2^657201231 is an apocalyptic number.

657201231 is a deficient number, since it is larger than the sum of its proper divisors (293419089).

657201231 is a wasteful number, since it uses less digits than its factorization.

657201231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102286 (or 102283 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 657201231 is about 25635.9363199396. The cubic root of 657201231 is about 869.4263320787.

Adding to 657201231 its reverse (132102756), we get a palindrome (789303987).

The spelling of 657201231 in words is "six hundred fifty-seven million, two hundred one thousand, two hundred thirty-one".