1393257497 has 2 divisors, whose sum is σ = 1393257498. Its totient is φ = 1393257496.

The previous prime is 1393257427. The next prime is 1393257553. The reversal of 1393257497 is 7947523931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 782376841 + 610880656 = 27971^2 + 24716^2 .

It is an emirp because it is prime and its reverse (7947523931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1393257497 is a prime.

It is not a weakly prime, because it can be changed into another prime (1393257427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 696628748 + 696628749.

It is an arithmetic number, because the mean of its divisors is an integer number (696628749).

Almost surely, 2^1393257497 is an apocalyptic number.

It is an amenable number.

1393257497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1393257497 is an equidigital number, since it uses as much as digits as its factorization.

1393257497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1428840, while the sum is 50.

The square root of 1393257497 is about 37326.3646368087. The cubic root of 1393257497 is about 1116.8901552039.

The spelling of 1393257497 in words is "one billion, three hundred ninety-three million, two hundred fifty-seven thousand, four hundred ninety-seven".