2155983691 has 8 divisors (see below), whose sum is σ = 2228495744. Its totient is φ = 2083656960.

The previous prime is 2155983677. The next prime is 2155983733. The reversal of 2155983691 is 1963895512.

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

It is a cyclic number.

It is not a de Polignac number, because 2155983691 - 2¹⁹ = 2155459403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155983601) 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, 22470 + ... + 69403.

It is an arithmetic number, because the mean of its divisors is an integer number (278561968).

Almost surely, 2^2155983691 is an apocalyptic number.

2155983691 is a deficient number, since it is larger than the sum of its proper divisors (72512053).

2155983691 is an equidigital number, since it uses as much as digits as its factorization.

2155983691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92661.

The product of its digits is 583200, while the sum is 49.

The square root of 2155983691 is about 46432.5714450535. The cubic root of 2155983691 is about 1291.8591247560.

The spelling of 2155983691 in words is "two billion, one hundred fifty-five million, nine hundred eighty-three thousand, six hundred ninety-one".