25155139 has 4 divisors (see below), whose sum is σ = 25212880. Its totient is φ = 25097400.

The previous prime is 25155113. The next prime is 25155149. The reversal of 25155139 is 93155152.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25155139 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25155139.

It is not an unprimeable number, because it can be changed into a prime (25155149) 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, 28212 + ... + 29089.

It is an arithmetic number, because the mean of its divisors is an integer number (6303220).

Almost surely, 2^25155139 is an apocalyptic number.

25155139 is a deficient number, since it is larger than the sum of its proper divisors (57741).

25155139 is an equidigital number, since it uses as much as digits as its factorization.

25155139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57740.

The product of its digits is 6750, while the sum is 31.

The square root of 25155139 is about 5015.4899062803. The cubic root of 25155139 is about 293.0053659126.

The spelling of 25155139 in words is "twenty-five million, one hundred fifty-five thousand, one hundred thirty-nine".