1280121307 has 2 divisors, whose sum is σ = 1280121308. Its totient is φ = 1280121306.

The previous prime is 1280121263. The next prime is 1280121313. The reversal of 1280121307 is 7031210821.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1280121307 - 2²³ = 1271732699 is a prime.

It is not a weakly prime, because it can be changed into another prime (1280121377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640060653 + 640060654.

It is an arithmetic number, because the mean of its divisors is an integer number (640060654).

Almost surely, 2^1280121307 is an apocalyptic number.

1280121307 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280121307 is an equidigital number, since it uses as much as digits as its factorization.

1280121307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 1280121307 is about 35778.7829166952. The cubic root of 1280121307 is about 1085.8013453313.

The spelling of 1280121307 in words is "one billion, two hundred eighty million, one hundred twenty-one thousand, three hundred seven".