231657201 has 6 divisors (see below), whose sum is σ = 334615970. Its totient is φ = 154438128.

The previous prime is 231657193. The next prime is 231657241. The reversal of 231657201 is 102756132.

It is a happy number.

231657201 is a `hidden beast` number, since 2 + 3 + 1 + 657 + 2 + 0 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 216796176 + 14861025 = 14724^2 + 3855^2 .

It is not a de Polignac number, because 231657201 - 2³ = 231657193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231657241) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12869836 + ... + 12869853.

Almost surely, 2^231657201 is an apocalyptic number.

It is an amenable number.

231657201 is a deficient number, since it is larger than the sum of its proper divisors (102958769).

231657201 is a wasteful number, since it uses less digits than its factorization.

231657201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25739695 (or 25739692 counting only the distinct ones).

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

The square root of 231657201 is about 15220.2891234037. The cubic root of 231657201 is about 614.1605759748.

The spelling of 231657201 in words is "two hundred thirty-one million, six hundred fifty-seven thousand, two hundred one".