2531540155 has 4 divisors (see below), whose sum is σ = 3037848192. Its totient is φ = 2025232120.

The previous prime is 2531540021. The next prime is 2531540171. The reversal of 2531540155 is 5510451352.

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

It is not a de Polignac number, because 2531540155 - 2²¹ = 2529443003 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253154011 + ... + 253154020.

It is an arithmetic number, because the mean of its divisors is an integer number (759462048).

Almost surely, 2^2531540155 is an apocalyptic number.

2531540155 is a deficient number, since it is larger than the sum of its proper divisors (506308037).

2531540155 is an equidigital number, since it uses as much as digits as its factorization.

2531540155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506308036.

The product of its (nonzero) digits is 15000, while the sum is 31.

The square root of 2531540155 is about 50314.4129946877. The cubic root of 2531540155 is about 1362.8925163753.

The spelling of 2531540155 in words is "two billion, five hundred thirty-one million, five hundred forty thousand, one hundred fifty-five".