2564731247 has 4 divisors (see below), whose sum is σ = 2762018280. Its totient is φ = 2367444216.

The previous prime is 2564731241. The next prime is 2564731327. The reversal of 2564731247 is 7421374652.

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

It is a cyclic number.

It is not a de Polignac number, because 2564731247 - 2⁸ = 2564730991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2564731241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98643497 + ... + 98643522.

It is an arithmetic number, because the mean of its divisors is an integer number (690504570).

Almost surely, 2^2564731247 is an apocalyptic number.

2564731247 is a deficient number, since it is larger than the sum of its proper divisors (197287033).

2564731247 is a wasteful number, since it uses less digits than its factorization.

2564731247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197287032.

The product of its digits is 282240, while the sum is 41.

The square root of 2564731247 is about 50643.1757199329. The cubic root of 2564731247 is about 1368.8229802222.

The spelling of 2564731247 in words is "two billion, five hundred sixty-four million, seven hundred thirty-one thousand, two hundred forty-seven".