25358991 has 16 divisors (see below), whose sum is σ = 39465984. Its totient is φ = 14181984.

The previous prime is 25358953. The next prime is 25359007. The reversal of 25358991 is 19985352.

It is not a de Polignac number, because 25358991 - 2⁹ = 25358479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25358911) 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 15 ways as a sum of consecutive naturals, for example, 11860 + ... + 13833.

It is an arithmetic number, because the mean of its divisors is an integer number (2466624).

Almost surely, 2^25358991 is an apocalyptic number.

25358991 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

25358991 is a deficient number, since it is larger than the sum of its proper divisors (14106993).

25358991 is a wasteful number, since it uses less digits than its factorization.

25358991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25750.

The product of its digits is 97200, while the sum is 42.

The square root of 25358991 is about 5035.7711425362. The cubic root of 25358991 is about 293.7947222689.

The spelling of 25358991 in words is "twenty-five million, three hundred fifty-eight thousand, nine hundred ninety-one".