2131855515 has 12 divisors (see below), whose sum is σ = 3695216304. Its totient is φ = 1136989584.

The previous prime is 2131855489. The next prime is 2131855541. The reversal of 2131855515 is 5155581312.

2131855515 is a `hidden beast` number, since 2 + 131 + 8 + 5 + 5 + 515 = 666.

2131855515 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2131855489) and next prime (2131855541).

It is not a de Polignac number, because 2131855515 - 2⁵ = 2131855483 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2131855515.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23687239 + ... + 23687328.

It is an arithmetic number, because the mean of its divisors is an integer number (307934692).

Almost surely, 2^2131855515 is an apocalyptic number.

2131855515 is a deficient number, since it is larger than the sum of its proper divisors (1563360789).

2131855515 is a wasteful number, since it uses less digits than its factorization.

2131855515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47374578 (or 47374575 counting only the distinct ones).

The product of its digits is 30000, while the sum is 36.

The square root of 2131855515 is about 46172.0209109370. The cubic root of 2131855515 is about 1287.0218570772.

The spelling of 2131855515 in words is "two billion, one hundred thirty-one million, eight hundred fifty-five thousand, five hundred fifteen".