551149731 has 16 divisors (see below), whose sum is σ = 890747520. Its totient is φ = 334029960.

The previous prime is 551149717. The next prime is 551149733. The reversal of 551149731 is 137941155.

It is a happy number.

551149731 is a `hidden beast` number, since 551 + 14 + 97 + 3 + 1 = 666.

It is not a de Polignac number, because 551149731 - 2⁵ = 551149699 is a prime.

It is a super-2 number, since 2×551149731² = 607532051962744722, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (551149733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 927565 + ... + 928158.

It is an arithmetic number, because the mean of its divisors is an integer number (55671720).

Almost surely, 2^551149731 is an apocalyptic number.

551149731 is a deficient number, since it is larger than the sum of its proper divisors (339597789).

551149731 is a wasteful number, since it uses less digits than its factorization.

551149731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1855743 (or 1855737 counting only the distinct ones).

The product of its digits is 18900, while the sum is 36.

The square root of 551149731 is about 23476.5783494955. The cubic root of 551149731 is about 819.8917817726.

The spelling of 551149731 in words is "five hundred fifty-one million, one hundred forty-nine thousand, seven hundred thirty-one".