2155893761 has 4 divisors (see below), whose sum is σ = 2463878592. Its totient is φ = 1847908932.

The previous prime is 2155893749. The next prime is 2155893769. The reversal of 2155893761 is 1673985512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2155893761 - 2¹⁸ = 2155631617 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2155893769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153992405 + ... + 153992418.

It is an arithmetic number, because the mean of its divisors is an integer number (615969648).

Almost surely, 2^2155893761 is an apocalyptic number.

It is an amenable number.

2155893761 is a deficient number, since it is larger than the sum of its proper divisors (307984831).

2155893761 is an equidigital number, since it uses as much as digits as its factorization.

2155893761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307984830.

The product of its digits is 453600, while the sum is 47.

The square root of 2155893761 is about 46431.6030414630. The cubic root of 2155893761 is about 1291.8411625753.

The spelling of 2155893761 in words is "two billion, one hundred fifty-five million, eight hundred ninety-three thousand, seven hundred sixty-one".