155423591 has 4 divisors (see below), whose sum is σ = 163603800. Its totient is φ = 147243384.

The previous prime is 155423549. The next prime is 155423603. The reversal of 155423591 is 195324551.

155423591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 155423591 - 2¹⁴ = 155407207 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 (155423531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4090076 + ... + 4090113.

It is an arithmetic number, because the mean of its divisors is an integer number (40900950).

Almost surely, 2^155423591 is an apocalyptic number.

155423591 is a deficient number, since it is larger than the sum of its proper divisors (8180209).

155423591 is an equidigital number, since it uses as much as digits as its factorization.

155423591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8180208.

The product of its digits is 27000, while the sum is 35.

The square root of 155423591 is about 12466.8998151104. The cubic root of 155423591 is about 537.6574232241.

The spelling of 155423591 in words is "one hundred fifty-five million, four hundred twenty-three thousand, five hundred ninety-one".