25226991 has 16 divisors (see below), whose sum is σ = 37849600. Its totient is φ = 16603704.

The previous prime is 25226989. The next prime is 25227001. The reversal of 25226991 is 19962252.

It is a happy number.

It is not a de Polignac number, because 25226991 - 2¹ = 25226989 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 (25226941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3781 + ... + 8046.

It is an arithmetic number, because the mean of its divisors is an integer number (2365600).

Almost surely, 2^25226991 is an apocalyptic number.

25226991 is a deficient number, since it is larger than the sum of its proper divisors (12622609).

25226991 is a wasteful number, since it uses less digits than its factorization.

25226991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11915 (or 11909 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 25226991 is about 5022.6478076807. The cubic root of 25226991 is about 293.2840764686.

The spelling of 25226991 in words is "twenty-five million, two hundred twenty-six thousand, nine hundred ninety-one".