551404487 has 2 divisors, whose sum is σ = 551404488. Its totient is φ = 551404486.

The previous prime is 551404433. The next prime is 551404489. The reversal of 551404487 is 784404155.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 551404487 - 2²⁸ = 282969031 is a prime.

Together with 551404489, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 551404487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551404489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275702243 + 275702244.

It is an arithmetic number, because the mean of its divisors is an integer number (275702244).

Almost surely, 2^551404487 is an apocalyptic number.

551404487 is a deficient number, since it is larger than the sum of its proper divisors (1).

551404487 is an equidigital number, since it uses as much as digits as its factorization.

551404487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 89600, while the sum is 38.

The square root of 551404487 is about 23482.0034707433. The cubic root of 551404487 is about 820.0180875447.

The spelling of 551404487 in words is "five hundred fifty-one million, four hundred four thousand, four hundred eighty-seven".