155131945 has 8 divisors (see below), whose sum is σ = 189313920. Its totient is φ = 122001840.

The previous prime is 155131943. The next prime is 155131973. The reversal of 155131945 is 549131551.

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

It is not a de Polignac number, because 155131945 - 2¹ = 155131943 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155131945.

It is not an unprimeable number, because it can be changed into a prime (155131943) 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, 262641 + ... + 263230.

It is an arithmetic number, because the mean of its divisors is an integer number (23664240).

Almost surely, 2^155131945 is an apocalyptic number.

It is an amenable number.

155131945 is a deficient number, since it is larger than the sum of its proper divisors (34181975).

155131945 is an equidigital number, since it uses as much as digits as its factorization.

155131945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525935.

The product of its digits is 13500, while the sum is 34.

The square root of 155131945 is about 12455.1975094737. The cubic root of 155131945 is about 537.3209152804.

The spelling of 155131945 in words is "one hundred fifty-five million, one hundred thirty-one thousand, nine hundred forty-five".