1564994651 has 4 divisors (see below), whose sum is σ = 1707266904. Its totient is φ = 1422722400.

The previous prime is 1564994633. The next prime is 1564994663.

1564994651 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 1564994651 - 2¹⁰ = 1564993627 is a prime.

It is a super-2 number, since 2×1564994651² = 4898416515317223602, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1564994651.

It is not an unprimeable number, because it can be changed into a prime (1564994621) 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, 71136110 + ... + 71136131.

It is an arithmetic number, because the mean of its divisors is an integer number (426816726).

Almost surely, 2^1564994651 is an apocalyptic number.

1564994651 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1564994651 is a deficient number, since it is larger than the sum of its proper divisors (142272253).

1564994651 is a wasteful number, since it uses less digits than its factorization.

1564994651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142272252.

The product of its digits is 1166400, while the sum is 50.

The square root of 1564994651 is about 39560.0132836176. The cubic root of 1564994651 is about 1161.0144343955.

The spelling of 1564994651 in words is "one billion, five hundred sixty-four million, nine hundred ninety-four thousand, six hundred fifty-one".