1564792161 has 4 divisors (see below), whose sum is σ = 2086389552. Its totient is φ = 1043194772.

The previous prime is 1564792147. The next prime is 1564792181. The reversal of 1564792161 is 1612974651.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1612974651 = 3 ⋅537658217.

It is a cyclic number.

It is not a de Polignac number, because 1564792161 - 2⁵ = 1564792129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1564792181) 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, 260798691 + ... + 260798696.

It is an arithmetic number, because the mean of its divisors is an integer number (521597388).

Almost surely, 2^1564792161 is an apocalyptic number.

It is an amenable number.

1564792161 is a deficient number, since it is larger than the sum of its proper divisors (521597391).

1564792161 is an equidigital number, since it uses as much as digits as its factorization.

1564792161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521597390.

The product of its digits is 90720, while the sum is 42.

The square root of 1564792161 is about 39557.4539246398. The cubic root of 1564792161 is about 1160.9643588350.

The spelling of 1564792161 in words is "one billion, five hundred sixty-four million, seven hundred ninety-two thousand, one hundred sixty-one".