23231352581 has 2 divisors, whose sum is σ = 23231352582. Its totient is φ = 23231352580.

The previous prime is 23231352569. The next prime is 23231352589. The reversal of 23231352581 is 18525313232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18378140356 + 4853212225 = 135566^2 + 69665^2 .

It is a cyclic number.

It is not a de Polignac number, because 23231352581 - 2⁶ = 23231352517 is a prime.

It is a super-2 number, since 2×23231352581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23231352589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11615676290 + 11615676291.

It is an arithmetic number, because the mean of its divisors is an integer number (11615676291).

Almost surely, 2^23231352581 is an apocalyptic number.

It is an amenable number.

23231352581 is a deficient number, since it is larger than the sum of its proper divisors (1).

23231352581 is an equidigital number, since it uses as much as digits as its factorization.

23231352581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 35.

The spelling of 23231352581 in words is "twenty-three billion, two hundred thirty-one million, three hundred fifty-two thousand, five hundred eighty-one".