155105631 has 16 divisors (see below), whose sum is σ = 233683200. Its totient is φ = 101650104.

The previous prime is 155105623. The next prime is 155105647. The reversal of 155105631 is 136501551.

155105631 is a `hidden beast` number, since 15 + 5 + 10 + 5 + 631 = 666.

It is not a de Polignac number, because 155105631 - 2³ = 155105623 is a prime.

It is a super-2 number, since 2×155105631² = 48115513535816322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 155105595 and 155105604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155105651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47091 + ... + 50276.

It is an arithmetic number, because the mean of its divisors is an integer number (14605200).

Almost surely, 2^155105631 is an apocalyptic number.

155105631 is a deficient number, since it is larger than the sum of its proper divisors (78577569).

155105631 is an equidigital number, since it uses as much as digits as its factorization.

155105631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97435 (or 97429 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 27.

The square root of 155105631 is about 12454.1411185196. The cubic root of 155105631 is about 537.2905328382.

The spelling of 155105631 in words is "one hundred fifty-five million, one hundred five thousand, six hundred thirty-one".