551009191 has 2 divisors, whose sum is σ = 551009192. Its totient is φ = 551009190.

The previous prime is 551009189. The next prime is 551009213. The reversal of 551009191 is 191900155.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 551009191 - 2¹ = 551009189 is a prime.

It is a super-2 number, since 2×551009191² = 607222257132948962, which contains 22 as substring.

Together with 551009189, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551009161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275504595 + 275504596.

It is an arithmetic number, because the mean of its divisors is an integer number (275504596).

Almost surely, 2^551009191 is an apocalyptic number.

551009191 is a deficient number, since it is larger than the sum of its proper divisors (1).

551009191 is an equidigital number, since it uses as much as digits as its factorization.

551009191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2025, while the sum is 31.

The square root of 551009191 is about 23473.5849626767. The cubic root of 551009191 is about 819.8220866244.

The spelling of 551009191 in words is "five hundred fifty-one million, nine thousand, one hundred ninety-one".