1564623061 has 4 divisors (see below), whose sum is σ = 1587975712. Its totient is φ = 1541270412.

The previous prime is 1564623043. The next prime is 1564623083. The reversal of 1564623061 is 1603264651.

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.

It is a de Polignac number, because none of the positive numbers 2^k-1564623061 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 (1564626061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11676225 + ... + 11676358.

It is an arithmetic number, because the mean of its divisors is an integer number (396993928).

Almost surely, 2^1564623061 is an apocalyptic number.

It is an amenable number.

1564623061 is a deficient number, since it is larger than the sum of its proper divisors (23352651).

1564623061 is an equidigital number, since it uses as much as digits as its factorization.

1564623061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23352650.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 1564623061 is about 39555.3164694710. The cubic root of 1564623061 is about 1160.9225372755.

The spelling of 1564623061 in words is "one billion, five hundred sixty-four million, six hundred twenty-three thousand, sixty-one".