550156991 has 2 divisors, whose sum is σ = 550156992. Its totient is φ = 550156990.

The previous prime is 550156979. The next prime is 550156993. The reversal of 550156991 is 199651055.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 550156991 - 2⁶ = 550156927 is a prime.

It is a Sophie Germain prime.

Together with 550156993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (550156993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275078495 + 275078496.

It is an arithmetic number, because the mean of its divisors is an integer number (275078496).

Almost surely, 2^550156991 is an apocalyptic number.

550156991 is a deficient number, since it is larger than the sum of its proper divisors (1).

550156991 is an equidigital number, since it uses as much as digits as its factorization.

550156991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60750, while the sum is 41.

The square root of 550156991 is about 23455.4256196727. The cubic root of 550156991 is about 819.3992183760.

The spelling of 550156991 in words is "five hundred fifty million, one hundred fifty-six thousand, nine hundred ninety-one".