1497730391 has 2 divisors, whose sum is σ = 1497730392. Its totient is φ = 1497730390.

The previous prime is 1497730387. The next prime is 1497730393. The reversal of 1497730391 is 1930377941.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1497730391 - 2² = 1497730387 is a prime.

Together with 1497730393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1497730393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 748865195 + 748865196.

It is an arithmetic number, because the mean of its divisors is an integer number (748865196).

Almost surely, 2^1497730391 is an apocalyptic number.

1497730391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1497730391 is an equidigital number, since it uses as much as digits as its factorization.

1497730391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 142884, while the sum is 44.

The square root of 1497730391 is about 38700.5218440269. The cubic root of 1497730391 is about 1144.1366058427.

The spelling of 1497730391 in words is "one billion, four hundred ninety-seven million, seven hundred thirty thousand, three hundred ninety-one".