1564928399 has 2 divisors, whose sum is σ = 1564928400. Its totient is φ = 1564928398.

The previous prime is 1564928389. The next prime is 1564928401. The reversal of 1564928399 is 9938294651.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1564928399 - 2⁴ = 1564928383 is a prime.

Together with 1564928401, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1564928389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 782464199 + 782464200.

It is an arithmetic number, because the mean of its divisors is an integer number (782464200).

Almost surely, 2^1564928399 is an apocalyptic number.

1564928399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1564928399 is an equidigital number, since it uses as much as digits as its factorization.

1564928399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4199040, while the sum is 56.

The square root of 1564928399 is about 39559.1759140658. The cubic root of 1564928399 is about 1160.9980508222.

The spelling of 1564928399 in words is "one billion, five hundred sixty-four million, nine hundred twenty-eight thousand, three hundred ninety-nine".