25700921 has 2 divisors, whose sum is σ = 25700922. Its totient is φ = 25700920.

The previous prime is 25700911. The next prime is 25700929. The reversal of 25700921 is 12900752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24403600 + 1297321 = 4940^2 + 1139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25700921 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25700929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12850460 + 12850461.

It is an arithmetic number, because the mean of its divisors is an integer number (12850461).

Almost surely, 2^25700921 is an apocalyptic number.

It is an amenable number.

25700921 is a deficient number, since it is larger than the sum of its proper divisors (1).

25700921 is an equidigital number, since it uses as much as digits as its factorization.

25700921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 25700921 is about 5069.6075785015. The cubic root of 25700921 is about 295.1092997265.

The spelling of 25700921 in words is "twenty-five million, seven hundred thousand, nine hundred twenty-one".