1320267961 has 2 divisors, whose sum is σ = 1320267962. Its totient is φ = 1320267960.

The previous prime is 1320267947. The next prime is 1320267967. The reversal of 1320267961 is 1697620231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 814017961 + 506250000 = 28531^2 + 22500^2 .

It is an emirp because it is prime and its reverse (1697620231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1320267961 - 2⁹ = 1320267449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1320267961.

It is not a weakly prime, because it can be changed into another prime (1320267967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660133980 + 660133981.

It is an arithmetic number, because the mean of its divisors is an integer number (660133981).

Almost surely, 2^1320267961 is an apocalyptic number.

It is an amenable number.

1320267961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320267961 is an equidigital number, since it uses as much as digits as its factorization.

1320267961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 1320267961 is about 36335.4917539312. The cubic root of 1320267961 is about 1097.0355334567.

The spelling of 1320267961 in words is "one billion, three hundred twenty million, two hundred sixty-seven thousand, nine hundred sixty-one".