25823991 has 4 divisors (see below), whose sum is σ = 34431992. Its totient is φ = 17215992.

The previous prime is 25823989. The next prime is 25824013. The reversal of 25823991 is 19932852.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 25823991 - 2¹ = 25823989 is a prime.

It is a super-2 number, since 2×25823991² = 1333757022336162, 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 (25823911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4303996 + ... + 4304001.

It is an arithmetic number, because the mean of its divisors is an integer number (8607998).

Almost surely, 2^25823991 is an apocalyptic number.

25823991 is a deficient number, since it is larger than the sum of its proper divisors (8608001).

25823991 is an equidigital number, since it uses as much as digits as its factorization.

25823991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8608000.

The product of its digits is 38880, while the sum is 39.

The square root of 25823991 is about 5081.7311026854. The cubic root of 25823991 is about 295.5795978321.

The spelling of 25823991 in words is "twenty-five million, eight hundred twenty-three thousand, nine hundred ninety-one".