155725 has 6 divisors (see below), whose sum is σ = 193130. Its totient is φ = 124560.

The previous prime is 155723. The next prime is 155731. The reversal of 155725 is 527551.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 9801 + 145924 = 99^2 + 382^2 .

It is not a de Polignac number, because 155725 - 2¹ = 155723 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 6229 = 155725 / (1 + 5 + 5 + 7 + 2 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 155725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3090 + ... + 3139.

2¹⁵⁵⁷²⁵ is an apocalyptic number.

It is an amenable number.

155725 is a deficient number, since it is larger than the sum of its proper divisors (37405).

155725 is an equidigital number, since it uses as much as digits as its factorization.

155725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6239 (or 6234 counting only the distinct ones).

The product of its digits is 1750, while the sum is 25.

The square root of 155725 is about 394.6200704475. The cubic root of 155725 is about 53.8004753900.

The spelling of 155725 in words is "one hundred fifty-five thousand, seven hundred twenty-five".