155420531 has 8 divisors (see below), whose sum is σ = 177713664. Its totient is φ = 133149960.

The previous prime is 155420527. The next prime is 155420543. The reversal of 155420531 is 135024551.

155420531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155420531 - 2² = 155420527 is a prime.

It is a super-2 number, since 2×155420531² = 48311082912643922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155420531.

It is not an unprimeable number, because it can be changed into a prime (155420501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13436 + ... + 22166.

It is an arithmetic number, because the mean of its divisors is an integer number (22214208).

Almost surely, 2^155420531 is an apocalyptic number.

155420531 is a deficient number, since it is larger than the sum of its proper divisors (22293133).

155420531 is an equidigital number, since it uses as much as digits as its factorization.

155420531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11281.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 155420531 is about 12466.7770895288. Note that the first 3 decimals coincide. The cubic root of 155420531 is about 537.6538947110.

The spelling of 155420531 in words is "one hundred fifty-five million, four hundred twenty thousand, five hundred thirty-one".