1302040391 has 2 divisors, whose sum is σ = 1302040392. Its totient is φ = 1302040390.

The previous prime is 1302040357. The next prime is 1302040423. The reversal of 1302040391 is 1930402031.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1302040391 - 2²² = 1297846087 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1302040351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 651020195 + 651020196.

It is an arithmetic number, because the mean of its divisors is an integer number (651020196).

Almost surely, 2^1302040391 is an apocalyptic number.

1302040391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1302040391 is an equidigital number, since it uses as much as digits as its factorization.

1302040391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 1302040391 is about 36083.7967930205. The cubic root of 1302040391 is about 1091.9635764417.

The spelling of 1302040391 in words is "one billion, three hundred two million, forty thousand, three hundred ninety-one".