25072991 has 4 divisors (see below), whose sum is σ = 25354800. Its totient is φ = 24791184.

The previous prime is 25072987. The next prime is 25073003. The reversal of 25072991 is 19927052.

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 25072991 - 2² = 25072987 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25072961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140771 + ... + 140948.

It is an arithmetic number, because the mean of its divisors is an integer number (6338700).

Almost surely, 2^25072991 is an apocalyptic number.

25072991 is a deficient number, since it is larger than the sum of its proper divisors (281809).

25072991 is an equidigital number, since it uses as much as digits as its factorization.

25072991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281808.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 25072991 is about 5007.2937800772. The cubic root of 25072991 is about 292.6860666280.

The spelling of 25072991 in words is "twenty-five million, seventy-two thousand, nine hundred ninety-one".