2113761561 has 8 divisors (see below), whose sum is σ = 2820760224. Its totient is φ = 1407968640.

The previous prime is 2113761547. The next prime is 2113761583. The reversal of 2113761561 is 1651673112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2113761561 - 2²¹ = 2111664409 is a prime.

It is a super-2 number, since 2×2113761561² = 8935975873522313442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2113761061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 297336 + ... + 304361.

It is an arithmetic number, because the mean of its divisors is an integer number (352595028).

Almost surely, 2^2113761561 is an apocalyptic number.

It is an amenable number.

2113761561 is a deficient number, since it is larger than the sum of its proper divisors (706998663).

2113761561 is a wasteful number, since it uses less digits than its factorization.

2113761561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602871.

The product of its digits is 7560, while the sum is 33.

The square root of 2113761561 is about 45975.6627032172. The cubic root of 2113761561 is about 1283.3703416700.

The spelling of 2113761561 in words is "two billion, one hundred thirteen million, seven hundred sixty-one thousand, five hundred sixty-one".