551138693 has 4 divisors (see below), whose sum is σ = 629872800. Its totient is φ = 472404588.

The previous prime is 551138669. The next prime is 551138699. The reversal of 551138693 is 396831155.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 551138693 - 2²² = 546944389 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 551138693.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551138699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39367043 + ... + 39367056.

It is an arithmetic number, because the mean of its divisors is an integer number (157468200).

Almost surely, 2^551138693 is an apocalyptic number.

It is an amenable number.

551138693 is a deficient number, since it is larger than the sum of its proper divisors (78734107).

551138693 is an equidigital number, since it uses as much as digits as its factorization.

551138693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78734106.

The product of its digits is 97200, while the sum is 41.

The square root of 551138693 is about 23476.3432629530. The cubic root of 551138693 is about 819.8863083502.

The spelling of 551138693 in words is "five hundred fifty-one million, one hundred thirty-eight thousand, six hundred ninety-three".