155399091 has 8 divisors (see below), whose sum is σ = 219387024. Its totient is φ = 97505280.

The previous prime is 155399077. The next prime is 155399213. The reversal of 155399091 is 190993551.

155399091 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 not a de Polignac number, because 155399091 - 2⁵ = 155399059 is a prime.

It is a super-3 number, since 3×155399091³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (155399051) 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, 1523470 + ... + 1523571.

It is an arithmetic number, because the mean of its divisors is an integer number (27423378).

Almost surely, 2^155399091 is an apocalyptic number.

155399091 is a deficient number, since it is larger than the sum of its proper divisors (63987933).

155399091 is a wasteful number, since it uses less digits than its factorization.

155399091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3047061.

The product of its (nonzero) digits is 54675, while the sum is 42.

The square root of 155399091 is about 12465.9171744401. The cubic root of 155399091 is about 537.6291707583.

The spelling of 155399091 in words is "one hundred fifty-five million, three hundred ninety-nine thousand, ninety-one".