155172345 has 16 divisors (see below), whose sum is σ = 262880640. Its totient is φ = 77890304.

The previous prime is 155172343. The next prime is 155172397. The reversal of 155172345 is 543271551.

It is a cyclic number.

It is not a de Polignac number, because 155172345 - 2¹ = 155172343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155172343) 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, 304005 + ... + 304514.

It is an arithmetic number, because the mean of its divisors is an integer number (16430040).

Almost surely, 2^155172345 is an apocalyptic number.

155172345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155172345 is a deficient number, since it is larger than the sum of its proper divisors (107708295).

155172345 is a wasteful number, since it uses less digits than its factorization.

155172345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608544.

The product of its digits is 21000, while the sum is 33.

The square root of 155172345 is about 12456.8192167985. The cubic root of 155172345 is about 537.3675548917.

The spelling of 155172345 in words is "one hundred fifty-five million, one hundred seventy-two thousand, three hundred forty-five".