551738987 has 2 divisors, whose sum is σ = 551738988. Its totient is φ = 551738986.

The previous prime is 551738983. The next prime is 551739049. The reversal of 551738987 is 789837155.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 551738987 - 2² = 551738983 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (551738983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275869493 + 275869494.

It is an arithmetic number, because the mean of its divisors is an integer number (275869494).

Almost surely, 2^551738987 is an apocalyptic number.

551738987 is a deficient number, since it is larger than the sum of its proper divisors (1).

551738987 is an equidigital number, since it uses as much as digits as its factorization.

551738987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2116800, while the sum is 53.

The square root of 551738987 is about 23489.1248666271. The cubic root of 551738987 is about 820.1838706252.

The spelling of 551738987 in words is "five hundred fifty-one million, seven hundred thirty-eight thousand, nine hundred eighty-seven".