551603081 has 2 divisors, whose sum is σ = 551603082. Its totient is φ = 551603080.

The previous prime is 551603077. The next prime is 551603153. The reversal of 551603081 is 180306155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 551310400 + 292681 = 23480^2 + 541^2 .

It is a cyclic number.

It is not a de Polignac number, because 551603081 - 2² = 551603077 is a prime.

It is a super-2 number, since 2×551603081² = 608531917937385122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (551602081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275801540 + 275801541.

It is an arithmetic number, because the mean of its divisors is an integer number (275801541).

Almost surely, 2^551603081 is an apocalyptic number.

It is an amenable number.

551603081 is a deficient number, since it is larger than the sum of its proper divisors (1).

551603081 is an equidigital number, since it uses as much as digits as its factorization.

551603081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 551603081 is about 23486.2317326556. The cubic root of 551603081 is about 820.1165217124.

The spelling of 551603081 in words is "five hundred fifty-one million, six hundred three thousand, eighty-one".