551685131 has 2 divisors, whose sum is σ = 551685132. Its totient is φ = 551685130.

The previous prime is 551685119. The next prime is 551685151. The reversal of 551685131 is 131586155.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 551685131 - 2¹⁸ = 551422987 is a prime.

It is a super-2 number, since 2×551685131² = 608712967532974322, which contains 22 as substring.

It is a Sophie Germain prime.

It is equal to p_28929221 and since 551685131 and 28929221 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 551685091 and 551685100.

It is not a weakly prime, because it can be changed into another prime (551685151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275842565 + 275842566.

It is an arithmetic number, because the mean of its divisors is an integer number (275842566).

Almost surely, 2^551685131 is an apocalyptic number.

551685131 is a deficient number, since it is larger than the sum of its proper divisors (1).

551685131 is an equidigital number, since it uses as much as digits as its factorization.

551685131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18000, while the sum is 35.

The square root of 551685131 is about 23487.9784357871. The cubic root of 551685131 is about 820.1571833323.

The spelling of 551685131 in words is "five hundred fifty-one million, six hundred eighty-five thousand, one hundred thirty-one".