155500813 has 16 divisors (see below), whose sum is σ = 176198400. Its totient is φ = 136221120.

The previous prime is 155500811. The next prime is 155500841. The reversal of 155500813 is 318005551.

It is not a de Polignac number, because 155500813 - 2¹ = 155500811 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 (155500811) 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, 18748 + ... + 25738.

It is an arithmetic number, because the mean of its divisors is an integer number (11012400).

Almost surely, 2^155500813 is an apocalyptic number.

155500813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

155500813 is a deficient number, since it is larger than the sum of its proper divisors (20697587).

155500813 is a wasteful number, since it uses less digits than its factorization.

155500813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7092.

The product of its (nonzero) digits is 3000, while the sum is 28.

The square root of 155500813 is about 12469.9965116274. The cubic root of 155500813 is about 537.7464532676.

The spelling of 155500813 in words is "one hundred fifty-five million, five hundred thousand, eight hundred thirteen".