23251681 has 2 divisors, whose sum is σ = 23251682. Its totient is φ = 23251680.

The previous prime is 23251673. The next prime is 23251693. The reversal of 23251681 is 18615232.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19580625 + 3671056 = 4425^2 + 1916^2 .

It is a cyclic number.

It is not a de Polignac number, because 23251681 - 2³ = 23251673 is a prime.

It is a super-2 number, since 2×23251681² = 1081281338651522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (23251181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11625840 + 11625841.

It is an arithmetic number, because the mean of its divisors is an integer number (11625841).

Almost surely, 2^23251681 is an apocalyptic number.

It is an amenable number.

23251681 is a deficient number, since it is larger than the sum of its proper divisors (1).

23251681 is an equidigital number, since it uses as much as digits as its factorization.

23251681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 28.

The square root of 23251681 is about 4821.9996889257. Note that the first 3 decimals coincide. The cubic root of 23251681 is about 285.4202520681.

It can be divided in two parts, 23251 and 681, that added together give a palindrome (23932).

The spelling of 23251681 in words is "twenty-three million, two hundred fifty-one thousand, six hundred eighty-one".