551683991 has 2 divisors, whose sum is σ = 551683992. Its totient is φ = 551683990.

The previous prime is 551683927. The next prime is 551683997. The reversal of 551683991 is 199386155.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 551683991 - 2⁶ = 551683927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551683997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275841995 + 275841996.

It is an arithmetic number, because the mean of its divisors is an integer number (275841996).

Almost surely, 2^551683991 is an apocalyptic number.

551683991 is a deficient number, since it is larger than the sum of its proper divisors (1).

551683991 is an equidigital number, since it uses as much as digits as its factorization.

551683991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 291600, while the sum is 47.

The square root of 551683991 is about 23487.9541680411. The cubic root of 551683991 is about 820.1566184087.

The spelling of 551683991 in words is "five hundred fifty-one million, six hundred eighty-three thousand, nine hundred ninety-one".