25312991 has 8 divisors (see below), whose sum is σ = 28003968. Its totient is φ = 22687000.

The previous prime is 25312951. The next prime is 25312993. The reversal of 25312991 is 19921352.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25312991 - 2¹⁰ = 25311967 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 (25312993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15425 + ... + 16986.

It is an arithmetic number, because the mean of its divisors is an integer number (3500496).

Almost surely, 2^25312991 is an apocalyptic number.

25312991 is a deficient number, since it is larger than the sum of its proper divisors (2690977).

25312991 is a wasteful number, since it uses less digits than its factorization.

25312991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32493.

The product of its digits is 4860, while the sum is 32.

The square root of 25312991 is about 5031.2017451102. The cubic root of 25312991 is about 293.6169715445.

The spelling of 25312991 in words is "twenty-five million, three hundred twelve thousand, nine hundred ninety-one".