231628517 has 2 divisors, whose sum is σ = 231628518. Its totient is φ = 231628516.

The previous prime is 231628511. The next prime is 231628541. The reversal of 231628517 is 715826132.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187525636 + 44102881 = 13694^2 + 6641^2 .

It is a cyclic number.

It is not a de Polignac number, because 231628517 - 2⁸ = 231628261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231628511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115814258 + 115814259.

It is an arithmetic number, because the mean of its divisors is an integer number (115814259).

Almost surely, 2^231628517 is an apocalyptic number.

It is an amenable number.

231628517 is a deficient number, since it is larger than the sum of its proper divisors (1).

231628517 is an equidigital number, since it uses as much as digits as its factorization.

231628517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 35.

The square root of 231628517 is about 15219.3467993866. The cubic root of 231628517 is about 614.1352262928.

The spelling of 231628517 in words is "two hundred thirty-one million, six hundred twenty-eight thousand, five hundred seventeen".