155130531 has 4 divisors (see below), whose sum is σ = 206840712. Its totient is φ = 103420352.

The previous prime is 155130517. The next prime is 155130539. The reversal of 155130531 is 135031551.

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 155130531 - 2⁵ = 155130499 is a prime.

It is a super-2 number, since 2×155130531² = 48130963296683922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155130539) 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, 25855086 + ... + 25855091.

It is an arithmetic number, because the mean of its divisors is an integer number (51710178).

Almost surely, 2^155130531 is an apocalyptic number.

155130531 is a deficient number, since it is larger than the sum of its proper divisors (51710181).

155130531 is an equidigital number, since it uses as much as digits as its factorization.

155130531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51710180.

The product of its (nonzero) digits is 1125, while the sum is 24.

The square root of 155130531 is about 12455.1407458928. The cubic root of 155130531 is about 537.3192827474.

The spelling of 155130531 in words is "one hundred fifty-five million, one hundred thirty thousand, five hundred thirty-one".