2155116361 has 4 divisors (see below), whose sum is σ = 2162136592. Its totient is φ = 2148096132.

The previous prime is 2155116347. The next prime is 2155116409. The reversal of 2155116361 is 1636115512.

It is a happy number.

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 2155116361 - 2¹³ = 2155108169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155119361) 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, 3509655 + ... + 3510268.

It is an arithmetic number, because the mean of its divisors is an integer number (540534148).

Almost surely, 2^2155116361 is an apocalyptic number.

It is an amenable number.

2155116361 is a deficient number, since it is larger than the sum of its proper divisors (7020231).

2155116361 is an equidigital number, since it uses as much as digits as its factorization.

2155116361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7020230.

The product of its digits is 5400, while the sum is 31.

The square root of 2155116361 is about 46423.2308332800. The cubic root of 2155116361 is about 1291.6858676540.

The spelling of 2155116361 in words is "two billion, one hundred fifty-five million, one hundred sixteen thousand, three hundred sixty-one".