155117210939 has 4 divisors (see below), whose sum is σ = 155125306224. Its totient is φ = 155109115656.

The previous prime is 155117210929. The next prime is 155117210971. The reversal of 155117210939 is 939012711551.

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 155117210939 - 2³² = 150822243643 is a prime.

It is a super-2 number, since 2×155117210939² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155117210939.

It is not an unprimeable number, because it can be changed into a prime (155117210929) 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, 4018832 + ... + 4057245.

It is an arithmetic number, because the mean of its divisors is an integer number (38781326556).

Almost surely, 2^155117210939 is an apocalyptic number.

155117210939 is a deficient number, since it is larger than the sum of its proper divisors (8095285).

155117210939 is an equidigital number, since it uses as much as digits as its factorization.

155117210939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8095284.

The product of its (nonzero) digits is 85050, while the sum is 44.

The spelling of 155117210939 in words is "one hundred fifty-five billion, one hundred seventeen million, two hundred ten thousand, nine hundred thirty-nine".