25731971 has 4 divisors (see below), whose sum is σ = 25783632. Its totient is φ = 25680312.

The previous prime is 25731967. The next prime is 25731997. The reversal of 25731971 is 17913752.

It is a happy number.

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 25731971 - 2² = 25731967 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25731911) 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, 25076 + ... + 26081.

It is an arithmetic number, because the mean of its divisors is an integer number (6445908).

Almost surely, 2^25731971 is an apocalyptic number.

25731971 is a deficient number, since it is larger than the sum of its proper divisors (51661).

25731971 is an equidigital number, since it uses as much as digits as its factorization.

25731971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51660.

The product of its digits is 13230, while the sum is 35.

The square root of 25731971 is about 5072.6690213338. The cubic root of 25731971 is about 295.2280951599.

The spelling of 25731971 in words is "twenty-five million, seven hundred thirty-one thousand, nine hundred seventy-one".