1320761647 has 2 divisors, whose sum is σ = 1320761648. Its totient is φ = 1320761646.

The previous prime is 1320761639. The next prime is 1320761693. The reversal of 1320761647 is 7461670231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1320761647 - 2³ = 1320761639 is a prime.

It is a super-2 number, since 2×1320761647² = 3488822656372305218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320764647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660380823 + 660380824.

It is an arithmetic number, because the mean of its divisors is an integer number (660380824).

Almost surely, 2^1320761647 is an apocalyptic number.

1320761647 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320761647 is an equidigital number, since it uses as much as digits as its factorization.

1320761647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 1320761647 is about 36342.2845594495. The cubic root of 1320761647 is about 1097.1722540843.

The spelling of 1320761647 in words is "one billion, three hundred twenty million, seven hundred sixty-one thousand, six hundred forty-seven".