1564091651 has 2 divisors, whose sum is σ = 1564091652. Its totient is φ = 1564091650.

The previous prime is 1564091587. The next prime is 1564091663. The reversal of 1564091651 is 1561904651.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1564091651 - 2⁶ = 1564091587 is a prime.

It is not a weakly prime, because it can be changed into another prime (1564093651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 782045825 + 782045826.

It is an arithmetic number, because the mean of its divisors is an integer number (782045826).

Almost surely, 2^1564091651 is an apocalyptic number.

1564091651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1564091651 is an equidigital number, since it uses as much as digits as its factorization.

1564091651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 1564091651 is about 39548.5985971690. The cubic root of 1564091651 is about 1160.7910901305.

The spelling of 1564091651 in words is "one billion, five hundred sixty-four million, ninety-one thousand, six hundred fifty-one".