1560920891 has 2 divisors, whose sum is σ = 1560920892. Its totient is φ = 1560920890.

The previous prime is 1560920873. The next prime is 1560920899. The reversal of 1560920891 is 1980290651.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1560920891 - 2¹⁸ = 1560658747 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1560920899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780460445 + 780460446.

It is an arithmetic number, because the mean of its divisors is an integer number (780460446).

Almost surely, 2^1560920891 is an apocalyptic number.

1560920891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1560920891 is an equidigital number, since it uses as much as digits as its factorization.

1560920891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 1560920891 is about 39508.4913784366. The cubic root of 1560920891 is about 1160.0061659898.

The spelling of 1560920891 in words is "one billion, five hundred sixty million, nine hundred twenty thousand, eight hundred ninety-one".