1305431087 has 2 divisors, whose sum is σ = 1305431088. Its totient is φ = 1305431086.

The previous prime is 1305431059. The next prime is 1305431093. The reversal of 1305431087 is 7801345031.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1305431087 - 2⁸ = 1305430831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1305437087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652715543 + 652715544.

It is an arithmetic number, because the mean of its divisors is an integer number (652715544).

Almost surely, 2^1305431087 is an apocalyptic number.

1305431087 is a deficient number, since it is larger than the sum of its proper divisors (1).

1305431087 is an equidigital number, since it uses as much as digits as its factorization.

1305431087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 1305431087 is about 36130.7498815067. The cubic root of 1305431087 is about 1092.9106303223.

The spelling of 1305431087 in words is "one billion, three hundred five million, four hundred thirty-one thousand, eighty-seven".