25965191 has 16 divisors (see below), whose sum is σ = 31426560. Its totient is φ = 20956320.

The previous prime is 25965161. The next prime is 25965209. The reversal of 25965191 is 19156952.

It is a de Polignac number, because none of the positive numbers 2^k-25965191 is a prime.

It is a super-2 number, since 2×25965191² = 1348382287332962, 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 (25965101) 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, 25706 + ... + 26696.

It is an arithmetic number, because the mean of its divisors is an integer number (1964160).

Almost surely, 2^25965191 is an apocalyptic number.

25965191 is a deficient number, since it is larger than the sum of its proper divisors (5461369).

25965191 is a wasteful number, since it uses less digits than its factorization.

25965191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1214.

The product of its digits is 24300, while the sum is 38.

The square root of 25965191 is about 5095.6050671142. The cubic root of 25965191 is about 296.1173407127.

It can be divided in two parts, 2596 and 5191, that multiplied together give a triangular number (13475836 = T₅₁₉₁).

The spelling of 25965191 in words is "twenty-five million, nine hundred sixty-five thousand, one hundred ninety-one".