551633681 has 2 divisors, whose sum is σ = 551633682. Its totient is φ = 551633680.

The previous prime is 551633609. The next prime is 551633711. The reversal of 551633681 is 186336155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 335073025 + 216560656 = 18305^2 + 14716^2 .

It is a cyclic number.

It is not a de Polignac number, because 551633681 - 2¹⁰ = 551632657 is a prime.

It is a super-2 number, since 2×551633681² = 608599436027219522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (551633581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275816840 + 275816841.

It is an arithmetic number, because the mean of its divisors is an integer number (275816841).

Almost surely, 2^551633681 is an apocalyptic number.

It is an amenable number.

551633681 is a deficient number, since it is larger than the sum of its proper divisors (1).

551633681 is an equidigital number, since it uses as much as digits as its factorization.

551633681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 38.

The square root of 551633681 is about 23486.8831691223. The cubic root of 551633681 is about 820.1316866637.

The spelling of 551633681 in words is "five hundred fifty-one million, six hundred thirty-three thousand, six hundred eighty-one".