25121939 has 2 divisors, whose sum is σ = 25121940. Its totient is φ = 25121938.

The previous prime is 25121897. The next prime is 25121953. The reversal of 25121939 is 93912152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25121939 - 2⁸ = 25121683 is a prime.

It is a super-2 number, since 2×25121939² = 1262223638239442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25121969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12560969 + 12560970.

It is an arithmetic number, because the mean of its divisors is an integer number (12560970).

Almost surely, 2^25121939 is an apocalyptic number.

25121939 is a deficient number, since it is larger than the sum of its proper divisors (1).

25121939 is an equidigital number, since it uses as much as digits as its factorization.

25121939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4860, while the sum is 32.

The square root of 25121939 is about 5012.1790670326. The cubic root of 25121939 is about 292.8764053730.

The spelling of 25121939 in words is "twenty-five million, one hundred twenty-one thousand, nine hundred thirty-nine".