551993931 has 12 divisors (see below), whose sum is σ = 806284440. Its totient is φ = 363860640.

The previous prime is 551993903. The next prime is 551993933. The reversal of 551993931 is 139399155.

It is a happy number.

551993931 is a `hidden beast` number, since 551 + 9 + 9 + 3 + 93 + 1 = 666.

It is not a de Polignac number, because 551993931 - 2⁵ = 551993899 is a prime.

It is a super-2 number, since 2×551993931² = 609394599721665522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (551993933) 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 11 ways as a sum of consecutive naturals, for example, 343765 + ... + 345366.

It is an arithmetic number, because the mean of its divisors is an integer number (67190370).

Almost surely, 2^551993931 is an apocalyptic number.

551993931 is a deficient number, since it is larger than the sum of its proper divisors (254290509).

551993931 is a wasteful number, since it uses less digits than its factorization.

551993931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689226 (or 689223 counting only the distinct ones).

The product of its digits is 164025, while the sum is 45.

The square root of 551993931 is about 23494.5510916893. The cubic root of 551993931 is about 820.3101796005.

The spelling of 551993931 in words is "five hundred fifty-one million, nine hundred ninety-three thousand, nine hundred thirty-one".