1302991121 has 2 divisors, whose sum is σ = 1302991122. Its totient is φ = 1302991120.

The previous prime is 1302991093. The next prime is 1302991127. The reversal of 1302991121 is 1211992031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1034522896 + 268468225 = 32164^2 + 16385^2 .

It is an emirp because it is prime and its reverse (1211992031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1302991121 - 2²⁶ = 1235882257 is a prime.

It is a super-2 number, since 2×1302991121² = 3395571722809673282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1302991127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 651495560 + 651495561.

It is an arithmetic number, because the mean of its divisors is an integer number (651495561).

Almost surely, 2^1302991121 is an apocalyptic number.

It is an amenable number.

1302991121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1302991121 is an equidigital number, since it uses as much as digits as its factorization.

1302991121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 29.

The square root of 1302991121 is about 36096.9683076017. The cubic root of 1302991121 is about 1092.2292901520.

The spelling of 1302991121 in words is "one billion, three hundred two million, nine hundred ninety-one thousand, one hundred twenty-one".