551311031 has 2 divisors, whose sum is σ = 551311032. Its totient is φ = 551311030.

The previous prime is 551311009. The next prime is 551311069. The reversal of 551311031 is 130113155.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 551311031 - 2¹⁰ = 551310007 is a prime.

It is a super-2 number, since 2×551311031² = 607887705804565922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 551310994 and 551311012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551311091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275655515 + 275655516.

It is an arithmetic number, because the mean of its divisors is an integer number (275655516).

Almost surely, 2^551311031 is an apocalyptic number.

551311031 is a deficient number, since it is larger than the sum of its proper divisors (1).

551311031 is an equidigital number, since it uses as much as digits as its factorization.

551311031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225, while the sum is 20.

The square root of 551311031 is about 23480.0134369638. The cubic root of 551311031 is about 819.9717574052.

Adding to 551311031 its reverse (130113155), we get a palindrome (681424186).

The spelling of 551311031 in words is "five hundred fifty-one million, three hundred eleven thousand, thirty-one".