1491340369 has 2 divisors, whose sum is σ = 1491340370. Its totient is φ = 1491340368.

The previous prime is 1491340349. The next prime is 1491340387. The reversal of 1491340369 is 9630431941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1002355600 + 488984769 = 31660^2 + 22113^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1491340369 is a prime.

It is a super-2 number, since 2×1491340369² = 4448192192418112322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1491340339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745670184 + 745670185.

It is an arithmetic number, because the mean of its divisors is an integer number (745670185).

Almost surely, 2^1491340369 is an apocalyptic number.

It is an amenable number.

1491340369 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491340369 is an equidigital number, since it uses as much as digits as its factorization.

1491340369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 1491340369 is about 38617.8762880612. The cubic root of 1491340369 is about 1142.5071447346.

The spelling of 1491340369 in words is "one billion, four hundred ninety-one million, three hundred forty thousand, three hundred sixty-nine".