1340520491 has 2 divisors, whose sum is σ = 1340520492. Its totient is φ = 1340520490.

The previous prime is 1340520473. The next prime is 1340520521. The reversal of 1340520491 is 1940250431.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1340520491 - 2¹⁴ = 1340504107 is a prime.

It is not a weakly prime, because it can be changed into another prime (1340520421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670260245 + 670260246.

It is an arithmetic number, because the mean of its divisors is an integer number (670260246).

Almost surely, 2^1340520491 is an apocalyptic number.

1340520491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340520491 is an equidigital number, since it uses as much as digits as its factorization.

1340520491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1340520491 is about 36613.1191105046. The cubic root of 1340520491 is about 1102.6164961749.

The spelling of 1340520491 in words is "one billion, three hundred forty million, five hundred twenty thousand, four hundred ninety-one".