5157991 has 2 divisors, whose sum is σ = 5157992. Its totient is φ = 5157990.

The previous prime is 5157983. The next prime is 5158001. The reversal of 5157991 is 1997515.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5157991 - 2³ = 5157983 is a prime.

5157991 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 5157991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5157941) 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, 2578995 + 2578996.

It is an arithmetic number, because the mean of its divisors is an integer number (2578996).

Almost surely, 2^5157991 is an apocalyptic number.

5157991 is a deficient number, since it is larger than the sum of its proper divisors (1).

5157991 is an equidigital number, since it uses as much as digits as its factorization.

5157991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14175, while the sum is 37.

The square root of 5157991 is about 2271.1210888017. The cubic root of 5157991 is about 172.7800226784.

The spelling of 5157991 in words is "five million, one hundred fifty-seven thousand, nine hundred ninety-one".