155231613 has 16 divisors (see below), whose sum is σ = 236189760. Its totient is φ = 100690128.

The previous prime is 155231599. The next prime is 155231633. The reversal of 155231613 is 316132551.

155231613 is a `hidden beast` number, since 15 + 5 + 2 + 31 + 613 = 666.

It is not a de Polignac number, because 155231613 - 2⁴ = 155231597 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155231633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76695 + ... + 78692.

It is an arithmetic number, because the mean of its divisors is an integer number (14761860).

Almost surely, 2^155231613 is an apocalyptic number.

It is an amenable number.

155231613 is a deficient number, since it is larger than the sum of its proper divisors (80958147).

155231613 is a wasteful number, since it uses less digits than its factorization.

155231613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155433 (or 155427 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 155231613 is about 12459.1979276356. The cubic root of 155231613 is about 537.4359619399.

The spelling of 155231613 in words is "one hundred fifty-five million, two hundred thirty-one thousand, six hundred thirteen".