155987013 has 16 divisors (see below), whose sum is σ = 255979136. Its totient is φ = 82278720.

The previous prime is 155986991. The next prime is 155987021. The reversal of 155987013 is 310789551.

It is not a de Polignac number, because 155987013 - 2⁶ = 155986949 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155987023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 285418 + ... + 285963.

It is an arithmetic number, because the mean of its divisors is an integer number (15998696).

Almost surely, 2^155987013 is an apocalyptic number.

155987013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

155987013 is a deficient number, since it is larger than the sum of its proper divisors (99992123).

155987013 is a wasteful number, since it uses less digits than its factorization.

155987013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571404.

The product of its (nonzero) digits is 37800, while the sum is 39.

The square root of 155987013 is about 12489.4760898926. The cubic root of 155987013 is about 538.3063223792.

The spelling of 155987013 in words is "one hundred fifty-five million, nine hundred eighty-seven thousand, thirteen".