1391670563 has 2 divisors, whose sum is σ = 1391670564. Its totient is φ = 1391670562.

The previous prime is 1391670493. The next prime is 1391670571. The reversal of 1391670563 is 3650761931.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1391670563 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1391670563.

It is not a weakly prime, because it can be changed into another prime (1391670463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695835281 + 695835282.

It is an arithmetic number, because the mean of its divisors is an integer number (695835282).

Almost surely, 2^1391670563 is an apocalyptic number.

1391670563 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391670563 is an equidigital number, since it uses as much as digits as its factorization.

1391670563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060, while the sum is 41.

The square root of 1391670563 is about 37305.1010318964. The cubic root of 1391670563 is about 1116.4659444770.

The spelling of 1391670563 in words is "one billion, three hundred ninety-one million, six hundred seventy thousand, five hundred sixty-three".