155971913 has 8 divisors (see below), whose sum is σ = 162163680. Its totient is φ = 149893920.

The previous prime is 155971891. The next prime is 155971919. The reversal of 155971913 is 319179551.

155971913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 155971913 - 2¹⁴ = 155955529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155971919) 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, 25643 + ... + 31136.

It is an arithmetic number, because the mean of its divisors is an integer number (20270460).

Almost surely, 2^155971913 is an apocalyptic number.

It is an amenable number.

155971913 is a deficient number, since it is larger than the sum of its proper divisors (6191767).

155971913 is an equidigital number, since it uses as much as digits as its factorization.

155971913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56887.

The product of its digits is 42525, while the sum is 41.

The square root of 155971913 is about 12488.8715663186. The cubic root of 155971913 is about 538.2889519421.

The spelling of 155971913 in words is "one hundred fifty-five million, nine hundred seventy-one thousand, nine hundred thirteen".