551878131 has 24 divisors (see below), whose sum is σ = 860961744. Its totient is φ = 313521600.

The previous prime is 551878127. The next prime is 551878139. The reversal of 551878131 is 131878155.

It is a happy number.

It is not a de Polignac number, because 551878131 - 2² = 551878127 is a prime.

It is a super-2 number, since 2×551878131² = 609138942952106322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 551878131.

It is not an unprimeable number, because it can be changed into a prime (551878139) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14581 + ... + 36281.

It is an arithmetic number, because the mean of its divisors is an integer number (35873406).

Almost surely, 2^551878131 is an apocalyptic number.

551878131 is a deficient number, since it is larger than the sum of its proper divisors (309083613).

551878131 is a wasteful number, since it uses less digits than its factorization.

551878131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21891 (or 21884 counting only the distinct ones).

The product of its digits is 33600, while the sum is 39.

The square root of 551878131 is about 23492.0865612231. The cubic root of 551878131 is about 820.2528126883.

The spelling of 551878131 in words is "five hundred fifty-one million, eight hundred seventy-eight thousand, one hundred thirty-one".