155231525 has 12 divisors (see below), whose sum is σ = 194474532. Its totient is φ = 122903040.

The previous prime is 155231521. The next prime is 155231533. The reversal of 155231525 is 525132551.

It can be written as a sum of positive squares in 6 ways, for example, as 7219969 + 148011556 = 2687^2 + 12166^2 .

It is not a de Polignac number, because 155231525 - 2² = 155231521 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155231521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29582 + ... + 34431.

It is an arithmetic number, because the mean of its divisors is an integer number (16206211).

Almost surely, 2^155231525 is an apocalyptic number.

It is an amenable number.

155231525 is a deficient number, since it is larger than the sum of its proper divisors (39243007).

155231525 is an equidigital number, since it uses as much as digits as its factorization.

155231525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64120 (or 64115 counting only the distinct ones).

The product of its digits is 7500, while the sum is 29.

The square root of 155231525 is about 12459.1943961076. The cubic root of 155231525 is about 537.4358603833.

The spelling of 155231525 in words is "one hundred fifty-five million, two hundred thirty-one thousand, five hundred twenty-five".