25517155 has 4 divisors (see below), whose sum is σ = 30620592. Its totient is φ = 20413720.

The previous prime is 25517147. The next prime is 25517159. The reversal of 25517155 is 55171552.

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

It is not a de Polignac number, because 25517155 - 2³ = 25517147 is a prime.

It is a super-2 number, since 2×25517155² = 1302250398588050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25517159) 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, 2551711 + ... + 2551720.

It is an arithmetic number, because the mean of its divisors is an integer number (7655148).

Almost surely, 2^25517155 is an apocalyptic number.

25517155 is a deficient number, since it is larger than the sum of its proper divisors (5103437).

25517155 is an equidigital number, since it uses as much as digits as its factorization.

25517155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5103436.

The product of its digits is 8750, while the sum is 31.

The square root of 25517155 is about 5051.4507817062. The cubic root of 25517155 is about 294.4042559234.

The spelling of 25517155 in words is "twenty-five million, five hundred seventeen thousand, one hundred fifty-five".