155890091 has 8 divisors (see below), whose sum is σ = 178236384. Its totient is φ = 133562880.

The previous prime is 155890081. The next prime is 155890123. The reversal of 155890091 is 190098551.

155890091 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 155890091 - 2⁶ = 155890027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155890001) 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, 25931 + ... + 31371.

It is an arithmetic number, because the mean of its divisors is an integer number (22279548).

Almost surely, 2^155890091 is an apocalyptic number.

155890091 is a deficient number, since it is larger than the sum of its proper divisors (22346293).

155890091 is an equidigital number, since it uses as much as digits as its factorization.

155890091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9541.

The product of its (nonzero) digits is 16200, while the sum is 38.

The square root of 155890091 is about 12485.5953402311. The cubic root of 155890091 is about 538.1948076787.

The spelling of 155890091 in words is "one hundred fifty-five million, eight hundred ninety thousand, ninety-one".