501231355139 has 4 divisors (see below), whose sum is σ = 501232826256. Its totient is φ = 501229884024.

The previous prime is 501231355127. The next prime is 501231355147. The reversal of 501231355139 is 931553132105.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-501231355139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (501231355169) 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, 68477 + ... + 1003569.

It is an arithmetic number, because the mean of its divisors is an integer number (125308206564).

Almost surely, 2^501231355139 is an apocalyptic number.

501231355139 is a deficient number, since it is larger than the sum of its proper divisors (1471117).

501231355139 is an equidigital number, since it uses as much as digits as its factorization.

501231355139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471116.

The product of its (nonzero) digits is 60750, while the sum is 38.

The spelling of 501231355139 in words is "five hundred one billion, two hundred thirty-one million, three hundred fifty-five thousand, one hundred thirty-nine".