155321139 has 8 divisors (see below), whose sum is σ = 216099072. Its totient is φ = 99045320.

The previous prime is 155321123. The next prime is 155321141. The reversal of 155321139 is 931123551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155321139 - 2⁴ = 155321123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155321039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1125447 + ... + 1125584.

It is an arithmetic number, because the mean of its divisors is an integer number (27012384).

Almost surely, 2^155321139 is an apocalyptic number.

155321139 is a deficient number, since it is larger than the sum of its proper divisors (60777933).

155321139 is a wasteful number, since it uses less digits than its factorization.

155321139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2251057.

The product of its digits is 4050, while the sum is 30.

The square root of 155321139 is about 12462.7901771634. The cubic root of 155321139 is about 537.5392597247.

The spelling of 155321139 in words is "one hundred fifty-five million, three hundred twenty-one thousand, one hundred thirty-nine".