551944393 has 32 divisors (see below), whose sum is σ = 743242752. Its totient is φ = 395841600.

The previous prime is 551944381. The next prime is 551944403. The reversal of 551944393 is 393449155.

It is a happy number.

It is not a de Polignac number, because 551944393 - 2⁵ = 551944361 is a prime.

It is a super-2 number, since 2×551944393² = 609285225928276898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (551944373) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 490930 + ... + 492052.

It is an arithmetic number, because the mean of its divisors is an integer number (23226336).

Almost surely, 2^551944393 is an apocalyptic number.

It is an amenable number.

551944393 is a deficient number, since it is larger than the sum of its proper divisors (191298359).

551944393 is a wasteful number, since it uses less digits than its factorization.

551944393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1645.

The product of its digits is 291600, while the sum is 43.

The square root of 551944393 is about 23493.4968235893. The cubic root of 551944393 is about 820.2856396318.

The spelling of 551944393 in words is "five hundred fifty-one million, nine hundred forty-four thousand, three hundred ninety-three".