155700139 has 4 divisors (see below), whose sum is σ = 177943024. Its totient is φ = 133457256.

The previous prime is 155700113. The next prime is 155700191. The reversal of 155700139 is 931007551.

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 155700139 - 2¹¹ = 155698091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155700139.

It is not an unprimeable number, because it can be changed into a prime (155700439) 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, 11121432 + ... + 11121445.

It is an arithmetic number, because the mean of its divisors is an integer number (44485756).

Almost surely, 2^155700139 is an apocalyptic number.

155700139 is a deficient number, since it is larger than the sum of its proper divisors (22242885).

155700139 is an equidigital number, since it uses as much as digits as its factorization.

155700139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22242884.

The product of its (nonzero) digits is 4725, while the sum is 31.

The square root of 155700139 is about 12477.9861756615. The cubic root of 155700139 is about 537.9761221282.

The spelling of 155700139 in words is "one hundred fifty-five million, seven hundred thousand, one hundred thirty-nine".