25641919 has 4 divisors (see below), whose sum is σ = 25669944. Its totient is φ = 25613896.

The previous prime is 25641911. The next prime is 25641943. The reversal of 25641919 is 91914652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25641919 - 2³ = 25641911 is a prime.

It is a super-2 number, since 2×25641919² = 1315016020005122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25641911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12592 + ... + 14485.

It is an arithmetic number, because the mean of its divisors is an integer number (6417486).

Almost surely, 2^25641919 is an apocalyptic number.

25641919 is a deficient number, since it is larger than the sum of its proper divisors (28025).

25641919 is an equidigital number, since it uses as much as digits as its factorization.

25641919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28024.

The product of its digits is 19440, while the sum is 37.

The square root of 25641919 is about 5063.7850467807. The cubic root of 25641919 is about 294.8832977052.

The spelling of 25641919 in words is "twenty-five million, six hundred forty-one thousand, nine hundred nineteen".