251144149 has 2 divisors, whose sum is σ = 251144150. Its totient is φ = 251144148.

The previous prime is 251144141. The next prime is 251144177. The reversal of 251144149 is 941441152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 245141649 + 6002500 = 15657^2 + 2450^2 .

It is a cyclic number.

It is not a de Polignac number, because 251144149 - 2³ = 251144141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 251144149.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251144141) 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 as a sum of consecutive naturals, namely, 125572074 + 125572075.

It is an arithmetic number, because the mean of its divisors is an integer number (125572075).

Almost surely, 2^251144149 is an apocalyptic number.

It is an amenable number.

251144149 is a deficient number, since it is larger than the sum of its proper divisors (1).

251144149 is an equidigital number, since it uses as much as digits as its factorization.

251144149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 31.

The square root of 251144149 is about 15847.5281668783. The cubic root of 251144149 is about 630.9200875289.

It can be divided in two parts, 251 and 144149, that added together give a square (144400 = 380²).

The spelling of 251144149 in words is "two hundred fifty-one million, one hundred forty-four thousand, one hundred forty-nine".