25155121 has 4 divisors (see below), whose sum is σ = 26634852. Its totient is φ = 23675392.

The previous prime is 25155113. The next prime is 25155149. The reversal of 25155121 is 12155152.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21986721 + 3168400 = 4689^2 + 1780^2 .

It is a cyclic number.

It is not a de Polignac number, because 25155121 - 2³ = 25155113 is a prime.

It is a super-2 number, since 2×25155121² = 1265560225049282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25155092 and 25155101.

It is not an unprimeable number, because it can be changed into a prime (25155191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 739840 + ... + 739873.

It is an arithmetic number, because the mean of its divisors is an integer number (6658713).

Almost surely, 2^25155121 is an apocalyptic number.

It is an amenable number.

25155121 is a deficient number, since it is larger than the sum of its proper divisors (1479731).

25155121 is a wasteful number, since it uses less digits than its factorization.

25155121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1479730.

The product of its digits is 500, while the sum is 22.

The square root of 25155121 is about 5015.4881118392. The cubic root of 25155121 is about 293.0052960250.

The spelling of 25155121 in words is "twenty-five million, one hundred fifty-five thousand, one hundred twenty-one".