25691121 has 16 divisors (see below), whose sum is σ = 38177920. Its totient is φ = 17074800.

The previous prime is 25691077. The next prime is 25691143. The reversal of 25691121 is 12119652.

It is not a de Polignac number, because 25691121 - 2⁷ = 25690993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25691221) 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, 8796 + ... + 11346.

It is an arithmetic number, because the mean of its divisors is an integer number (2386120).

Almost surely, 2^25691121 is an apocalyptic number.

It is an amenable number.

25691121 is a deficient number, since it is larger than the sum of its proper divisors (12486799).

25691121 is a wasteful number, since it uses less digits than its factorization.

25691121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2933 (or 2927 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 25691121 is about 5068.6409421067. The cubic root of 25691121 is about 295.0717856519.

The spelling of 25691121 in words is "twenty-five million, six hundred ninety-one thousand, one hundred twenty-one".