1340407591 has 2 divisors, whose sum is σ = 1340407592. Its totient is φ = 1340407590.

The previous prime is 1340407583. The next prime is 1340407597. The reversal of 1340407591 is 1957040431.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1340407591 - 2³ = 1340407583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1340407597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670203795 + 670203796.

It is an arithmetic number, because the mean of its divisors is an integer number (670203796).

Almost surely, 2^1340407591 is an apocalyptic number.

1340407591 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340407591 is an equidigital number, since it uses as much as digits as its factorization.

1340407591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 1340407591 is about 36611.5772809640. The cubic root of 1340407591 is about 1102.5855408114.

The spelling of 1340407591 in words is "one billion, three hundred forty million, four hundred seven thousand, five hundred ninety-one".