501315991 has 4 divisors (see below), whose sum is σ = 546890184. Its totient is φ = 455741800.

The previous prime is 501315989. The next prime is 501316003. The reversal of 501315991 is 199513105.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 501315991 - 2¹ = 501315989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501315901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22787080 + ... + 22787101.

It is an arithmetic number, because the mean of its divisors is an integer number (136722546).

Almost surely, 2^501315991 is an apocalyptic number.

501315991 is a deficient number, since it is larger than the sum of its proper divisors (45574193).

501315991 is a wasteful number, since it uses less digits than its factorization.

501315991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45574192.

The product of its (nonzero) digits is 6075, while the sum is 34.

The square root of 501315991 is about 22390.0868913008. The cubic root of 501315991 is about 794.3962511279.

The spelling of 501315991 in words is "five hundred one million, three hundred fifteen thousand, nine hundred ninety-one".