25091001 has 24 divisors (see below), whose sum is σ = 41088320. Its totient is φ = 14626656.

The previous prime is 25090993. The next prime is 25091021. The reversal of 25091001 is 10019052.

It is not a de Polignac number, because 25091001 - 2³ = 25090993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25091021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3421 + ... + 7866.

Almost surely, 2^25091001 is an apocalyptic number.

It is an amenable number.

25091001 is a deficient number, since it is larger than the sum of its proper divisors (15997319).

25091001 is a wasteful number, since it uses less digits than its factorization.

25091001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11325 (or 11322 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 25091001 is about 5009.0918338557. The cubic root of 25091001 is about 292.7561289304.

The spelling of 25091001 in words is "twenty-five million, ninety-one thousand, one".