23431157 has 2 divisors, whose sum is σ = 23431158. Its totient is φ = 23431156.

The previous prime is 23431147. The next prime is 23431169. The reversal of 23431157 is 75113432.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21473956 + 1957201 = 4634^2 + 1399^2 .

It is a cyclic number.

It is not a de Polignac number, because 23431157 - 2¹⁰ = 23430133 is a prime.

It is equal to p_1473632 and since 23431157 and 1473632 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23431127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11715578 + 11715579.

It is an arithmetic number, because the mean of its divisors is an integer number (11715579).

Almost surely, 2^23431157 is an apocalyptic number.

It is an amenable number.

23431157 is a deficient number, since it is larger than the sum of its proper divisors (1).

23431157 is an equidigital number, since it uses as much as digits as its factorization.

23431157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 26.

The square root of 23431157 is about 4840.5740362069. The cubic root of 23431157 is about 286.1527416959.

Adding to 23431157 its reverse (75113432), we get a palindrome (98544589).

The spelling of 23431157 in words is "twenty-three million, four hundred thirty-one thousand, one hundred fifty-seven".