1309630961 has 2 divisors, whose sum is σ = 1309630962. Its totient is φ = 1309630960.

The previous prime is 1309630951. The next prime is 1309630969. The reversal of 1309630961 is 1690369031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1213198561 + 96432400 = 34831^2 + 9820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1309630961 is a prime.

It is not a weakly prime, because it can be changed into another prime (1309630969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 654815480 + 654815481.

It is an arithmetic number, because the mean of its divisors is an integer number (654815481).

Almost surely, 2^1309630961 is an apocalyptic number.

It is an amenable number.

1309630961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1309630961 is an equidigital number, since it uses as much as digits as its factorization.

1309630961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 1309630961 is about 36188.8237029058. The cubic root of 1309630961 is about 1094.0814244781.

Adding to 1309630961 its reverse (1690369031), we get a palindrome (2999999992).

The spelling of 1309630961 in words is "one billion, three hundred nine million, six hundred thirty thousand, nine hundred sixty-one".