2115401565 has 16 divisors (see below), whose sum is σ = 3427488000. Its totient is φ = 1113932352.

The previous prime is 2115401551. The next prime is 2115401569. The reversal of 2115401565 is 5651045112.

It is not a de Polignac number, because 2115401565 - 2⁶ = 2115401501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2115401569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 891390 + ... + 893759.

It is an arithmetic number, because the mean of its divisors is an integer number (214218000).

Almost surely, 2^2115401565 is an apocalyptic number.

It is an amenable number.

2115401565 is a deficient number, since it is larger than the sum of its proper divisors (1312086435).

2115401565 is a wasteful number, since it uses less digits than its factorization.

2115401565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1785236.

The product of its (nonzero) digits is 6000, while the sum is 30.

The square root of 2115401565 is about 45993.4948117666. The cubic root of 2115401565 is about 1283.7021653462.

Adding to 2115401565 its reverse (5651045112), we get a palindrome (7766446677).

The spelling of 2115401565 in words is "two billion, one hundred fifteen million, four hundred one thousand, five hundred sixty-five".