47990191 has 2 divisors, whose sum is σ = 47990192. Its totient is φ = 47990190.

The previous prime is 47990183. The next prime is 47990203. The reversal of 47990191 is 19109974.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 47990191 - 2³ = 47990183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47990161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23995095 + 23995096.

It is an arithmetic number, because the mean of its divisors is an integer number (23995096).

Almost surely, 2^47990191 is an apocalyptic number.

47990191 is a deficient number, since it is larger than the sum of its proper divisors (1).

47990191 is an equidigital number, since it uses as much as digits as its factorization.

47990191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412, while the sum is 40.

The square root of 47990191 is about 6927.4952905072. The cubic root of 47990191 is about 363.3993611356.

The spelling of 47990191 in words is "forty-seven million, nine hundred ninety thousand, one hundred ninety-one".