25651969 has 16 divisors (see below), whose sum is σ = 30753792. Its totient is φ = 20919888.

The previous prime is 25651943. The next prime is 25651987. The reversal of 25651969 is 96915652.

It is a cyclic number.

It is not a de Polignac number, because 25651969 - 2¹⁷ = 25520897 is a prime.

It is a super-2 number, since 2×25651969² = 1316047027153922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25651909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45282 + ... + 45844.

It is an arithmetic number, because the mean of its divisors is an integer number (1922112).

Almost surely, 2^25651969 is an apocalyptic number.

It is an amenable number.

25651969 is a deficient number, since it is larger than the sum of its proper divisors (5101823).

25651969 is a wasteful number, since it uses less digits than its factorization.

25651969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876.

The product of its digits is 145800, while the sum is 43.

The square root of 25651969 is about 5064.7772902666. Note that the first 3 decimals coincide. The cubic root of 25651969 is about 294.9218178338.

It can be divided in two parts, 256 and 51969, that added together give a palindrome (52225).

The spelling of 25651969 in words is "twenty-five million, six hundred fifty-one thousand, nine hundred sixty-nine".