155031923 has 4 divisors (see below), whose sum is σ = 155095248. Its totient is φ = 154968600.

The previous prime is 155031913. The next prime is 155031931. The reversal of 155031923 is 329130551.

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 155031923 - 2²⁴ = 138254707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155031913) 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, 27836 + ... + 32937.

It is an arithmetic number, because the mean of its divisors is an integer number (38773812).

Almost surely, 2^155031923 is an apocalyptic number.

155031923 is a deficient number, since it is larger than the sum of its proper divisors (63325).

155031923 is an equidigital number, since it uses as much as digits as its factorization.

155031923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63324.

The product of its (nonzero) digits is 4050, while the sum is 29.

The square root of 155031923 is about 12451.1815905158. The cubic root of 155031923 is about 537.2054104494.

The spelling of 155031923 in words is "one hundred fifty-five million, thirty-one thousand, nine hundred twenty-three".