155240031 has 4 divisors (see below), whose sum is σ = 206986712. Its totient is φ = 103493352.

The previous prime is 155240017. The next prime is 155240053. The reversal of 155240031 is 130042551.

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

It is not a de Polignac number, because 155240031 - 2⁶ = 155239967 is a prime.

It is a super-2 number, since 2×155240031² = 48198934449761922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155240011) 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, 25873336 + ... + 25873341.

It is an arithmetic number, because the mean of its divisors is an integer number (51746678).

Almost surely, 2^155240031 is an apocalyptic number.

155240031 is a deficient number, since it is larger than the sum of its proper divisors (51746681).

155240031 is an equidigital number, since it uses as much as digits as its factorization.

155240031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51746680.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 155240031 is about 12459.5357457652. The cubic root of 155240031 is about 537.4456765723.

Adding to 155240031 its reverse (130042551), we get a palindrome (285282582).

The spelling of 155240031 in words is "one hundred fifty-five million, two hundred forty thousand, thirty-one".