2564371949 has 4 divisors (see below), whose sum is σ = 2564630364. Its totient is φ = 2564113536.

The previous prime is 2564371939. The next prime is 2564371973. The reversal of 2564371949 is 9491734652.

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 987090724 + 1577281225 = 31418^2 + 39715^2 .

It is a cyclic number.

It is not a de Polignac number, because 2564371949 - 2⁴ = 2564371933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2564371897 and 2564371906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2564371939) 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, 113702 + ... + 134375.

It is an arithmetic number, because the mean of its divisors is an integer number (641157591).

Almost surely, 2^2564371949 is an apocalyptic number.

It is an amenable number.

2564371949 is a deficient number, since it is larger than the sum of its proper divisors (258415).

2564371949 is a wasteful number, since it uses less digits than its factorization.

2564371949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258414.

The product of its digits is 1632960, while the sum is 50.

The square root of 2564371949 is about 50639.6282470557. The cubic root of 2564371949 is about 1368.7590569128.

The spelling of 2564371949 in words is "two billion, five hundred sixty-four million, three hundred seventy-one thousand, nine hundred forty-nine".