1309581131 has 2 divisors, whose sum is σ = 1309581132. Its totient is φ = 1309581130.

The previous prime is 1309581083. The next prime is 1309581139. The reversal of 1309581131 is 1311859031.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1309581131 - 2⁶ = 1309581067 is a prime.

It is a super-2 number, since 2×1309581131² = 3430005477342478322, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1309581139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 654790565 + 654790566.

It is an arithmetic number, because the mean of its divisors is an integer number (654790566).

Almost surely, 2^1309581131 is an apocalyptic number.

1309581131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1309581131 is an equidigital number, since it uses as much as digits as its factorization.

1309581131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 1309581131 is about 36188.1352241311. The cubic root of 1309581131 is about 1094.0675481087.

The spelling of 1309581131 in words is "one billion, three hundred nine million, five hundred eighty-one thousand, one hundred thirty-one".