2521859161 has 4 divisors (see below), whose sum is σ = 2523054772. Its totient is φ = 2520663552.

The previous prime is 2521859159. The next prime is 2521859167. The reversal of 2521859161 is 1619581252.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 867891600 + 1653967561 = 29460^2 + 40669^2 .

It is a cyclic number.

It is not a de Polignac number, because 2521859161 - 2¹ = 2521859159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2521859167) 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, 594636 + ... + 598861.

It is an arithmetic number, because the mean of its divisors is an integer number (630763693).

Almost surely, 2^2521859161 is an apocalyptic number.

It is an amenable number.

2521859161 is a deficient number, since it is larger than the sum of its proper divisors (1195611).

2521859161 is a wasteful number, since it uses less digits than its factorization.

2521859161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1195610.

The product of its digits is 43200, while the sum is 40.

The square root of 2521859161 is about 50218.1158646957. The cubic root of 2521859161 is about 1361.1529944368.

The spelling of 2521859161 in words is "two billion, five hundred twenty-one million, eight hundred fifty-nine thousand, one hundred sixty-one".