1307123681 has 2 divisors, whose sum is σ = 1307123682. Its totient is φ = 1307123680.

The previous prime is 1307123647. The next prime is 1307123717. The reversal of 1307123681 is 1863217031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1243267600 + 63856081 = 35260^2 + 7991^2 .

It is a cyclic number.

It is not a de Polignac number, because 1307123681 - 2²⁶ = 1240014817 is a prime.

It is a super-2 number, since 2×1307123681² = 3417144634861979522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1307123611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 653561840 + 653561841.

It is an arithmetic number, because the mean of its divisors is an integer number (653561841).

Almost surely, 2^1307123681 is an apocalyptic number.

It is an amenable number.

1307123681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1307123681 is an equidigital number, since it uses as much as digits as its factorization.

1307123681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 1307123681 is about 36154.1654723214. The cubic root of 1307123681 is about 1093.3827744989.

The spelling of 1307123681 in words is "one billion, three hundred seven million, one hundred twenty-three thousand, six hundred eighty-one".