1299358961 has 2 divisors, whose sum is σ = 1299358962. Its totient is φ = 1299358960.

The previous prime is 1299358937. The next prime is 1299358969. The reversal of 1299358961 is 1698539921.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 888040000 + 411318961 = 29800^2 + 20281^2 .

It is a cyclic number.

It is not a de Polignac number, because 1299358961 - 2¹⁸ = 1299096817 is a prime.

It is not a weakly prime, because it can be changed into another prime (1299358969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 649679480 + 649679481.

It is an arithmetic number, because the mean of its divisors is an integer number (649679481).

Almost surely, 2^1299358961 is an apocalyptic number.

It is an amenable number.

1299358961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1299358961 is an equidigital number, since it uses as much as digits as its factorization.

1299358961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 53.

The square root of 1299358961 is about 36046.6220470102. The cubic root of 1299358961 is about 1091.2134624379.

The spelling of 1299358961 in words is "one billion, two hundred ninety-nine million, three hundred fifty-eight thousand, nine hundred sixty-one".