2251535865 has 16 divisors (see below), whose sum is σ = 3603045888. Its totient is φ = 1200622976.

The previous prime is 2251535863. The next prime is 2251535887. The reversal of 2251535865 is 5685351522.

It is a cyclic number.

It is not a de Polignac number, because 2251535865 - 2¹ = 2251535863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2251535863) 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, 170749 + ... + 183461.

It is an arithmetic number, because the mean of its divisors is an integer number (225190368).

Almost surely, 2^2251535865 is an apocalyptic number.

It is an amenable number.

2251535865 is a deficient number, since it is larger than the sum of its proper divisors (1351510023).

2251535865 is a wasteful number, since it uses less digits than its factorization.

2251535865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24528.

The product of its digits is 360000, while the sum is 42.

The square root of 2251535865 is about 47450.3515793087. The cubic root of 2251535865 is about 1310.6687852136.

The spelling of 2251535865 in words is "two billion, two hundred fifty-one million, five hundred thirty-five thousand, eight hundred sixty-five".