251155151 has 4 divisors (see below), whose sum is σ = 270474792. Its totient is φ = 231835512.

The previous prime is 251155139. The next prime is 251155159. The reversal of 251155151 is 151551152.

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-251155151 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 251155151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251155159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9659801 + ... + 9659826.

It is an arithmetic number, because the mean of its divisors is an integer number (67618698).

Almost surely, 2^251155151 is an apocalyptic number.

251155151 is a deficient number, since it is larger than the sum of its proper divisors (19319641).

251155151 is a wasteful number, since it uses less digits than its factorization.

251155151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19319640.

The product of its digits is 1250, while the sum is 26.

The square root of 251155151 is about 15847.8752834568. The cubic root of 251155151 is about 630.9293004072.

The spelling of 251155151 in words is "two hundred fifty-one million, one hundred fifty-five thousand, one hundred fifty-one".