251474761 has 8 divisors (see below), whose sum is σ = 266858280. Its totient is φ = 236156928.

The previous prime is 251474737. The next prime is 251474777. The reversal of 251474761 is 167474152.

It can be written as a sum of positive squares in 4 ways, for example, as 49266361 + 202208400 = 7019^2 + 14220^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-251474761 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 251474761.

It is not an unprimeable number, because it can be changed into a prime (251474701) 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 7 ways as a sum of consecutive naturals, for example, 8416 + ... + 23953.

It is an arithmetic number, because the mean of its divisors is an integer number (33357285).

Almost surely, 2^251474761 is an apocalyptic number.

It is an amenable number.

251474761 is a deficient number, since it is larger than the sum of its proper divisors (15383519).

251474761 is a wasteful number, since it uses less digits than its factorization.

251474761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32843.

The product of its digits is 47040, while the sum is 37.

The square root of 251474761 is about 15857.9557635907. The cubic root of 251474761 is about 631.1968187593.

The spelling of 251474761 in words is "two hundred fifty-one million, four hundred seventy-four thousand, seven hundred sixty-one".