501055987 has 4 divisors (see below), whose sum is σ = 501137280. Its totient is φ = 500974696.

The previous prime is 501055967. The next prime is 501055993. The reversal of 501055987 is 789550105.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-501055987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (501055967) 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, 30568 + ... + 44005.

It is an arithmetic number, because the mean of its divisors is an integer number (125284320).

Almost surely, 2^501055987 is an apocalyptic number.

501055987 is a deficient number, since it is larger than the sum of its proper divisors (81293).

501055987 is an equidigital number, since it uses as much as digits as its factorization.

501055987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81292.

The product of its (nonzero) digits is 63000, while the sum is 40.

The square root of 501055987 is about 22384.2799080069. The cubic root of 501055987 is about 794.2588913755.

The spelling of 501055987 in words is "five hundred one million, fifty-five thousand, nine hundred eighty-seven".