155790901 has 4 divisors (see below), whose sum is σ = 178046752. Its totient is φ = 133535052.

The previous prime is 155790893. The next prime is 155790911. The reversal of 155790901 is 109097551.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 155790901 - 2³ = 155790893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155790911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11127915 + ... + 11127928.

It is an arithmetic number, because the mean of its divisors is an integer number (44511688).

Almost surely, 2^155790901 is an apocalyptic number.

It is an amenable number.

155790901 is a deficient number, since it is larger than the sum of its proper divisors (22255851).

155790901 is an equidigital number, since it uses as much as digits as its factorization.

155790901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22255850.

The product of its (nonzero) digits is 14175, while the sum is 37.

The square root of 155790901 is about 12481.6225307450. The cubic root of 155790901 is about 538.0806356383.

The spelling of 155790901 in words is "one hundred fifty-five million, seven hundred ninety thousand, nine hundred one".