25219661 has 4 divisors (see below), whose sum is σ = 26316192. Its totient is φ = 24123132.

The previous prime is 25219651. The next prime is 25219673. The reversal of 25219661 is 16691252.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25219661 - 2²² = 21025357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25219651) 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, 548231 + ... + 548276.

It is an arithmetic number, because the mean of its divisors is an integer number (6579048).

Almost surely, 2^25219661 is an apocalyptic number.

It is an amenable number.

25219661 is a deficient number, since it is larger than the sum of its proper divisors (1096531).

25219661 is a wasteful number, since it uses less digits than its factorization.

25219661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1096530.

The product of its digits is 6480, while the sum is 32.

The square root of 25219661 is about 5021.9180598652. The cubic root of 25219661 is about 293.2556680003.

The spelling of 25219661 in words is "twenty-five million, two hundred nineteen thousand, six hundred sixty-one".