551311231 has 4 divisors (see below), whose sum is σ = 552502432. Its totient is φ = 550120032.

The previous prime is 551311193. The next prime is 551311249. The reversal of 551311231 is 132113155.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 551311231 - 2⁹ = 551310719 is a prime.

It is a super-2 number, since 2×551311231² = 607888146853470722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551311291) 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, 594906 + ... + 595831.

It is an arithmetic number, because the mean of its divisors is an integer number (138125608).

Almost surely, 2^551311231 is an apocalyptic number.

551311231 is a deficient number, since it is larger than the sum of its proper divisors (1191201).

551311231 is a wasteful number, since it uses less digits than its factorization.

551311231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1191200.

The product of its digits is 450, while the sum is 22.

The square root of 551311231 is about 23480.0176959047. The cubic root of 551311231 is about 819.9718565594.

Adding to 551311231 its reverse (132113155), we get a palindrome (683424386).

The spelling of 551311231 in words is "five hundred fifty-one million, three hundred eleven thousand, two hundred thirty-one".