25951921 has 2 divisors, whose sum is σ = 25951922. Its totient is φ = 25951920.

The previous prime is 25951909. The next prime is 25951931. The reversal of 25951921 is 12915952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24354225 + 1597696 = 4935^2 + 1264^2 .

It is a cyclic number.

It is not a de Polignac number, because 25951921 - 2¹¹ = 25949873 is a prime.

It is not a weakly prime, because it can be changed into another prime (25951931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12975960 + 12975961.

It is an arithmetic number, because the mean of its divisors is an integer number (12975961).

Almost surely, 2^25951921 is an apocalyptic number.

It is an amenable number.

25951921 is a deficient number, since it is larger than the sum of its proper divisors (1).

25951921 is an equidigital number, since it uses as much as digits as its factorization.

25951921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8100, while the sum is 34.

The square root of 25951921 is about 5094.3027982247. The cubic root of 25951921 is about 296.0668866681.

The spelling of 25951921 in words is "twenty-five million, nine hundred fifty-one thousand, nine hundred twenty-one".