1597000243 has 2 divisors, whose sum is σ = 1597000244. Its totient is φ = 1597000242.

The previous prime is 1597000189. The next prime is 1597000267. The reversal of 1597000243 is 3420007951.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1597000243 is a prime.

It is a super-2 number, since 2×1597000243² = 5100819552284118098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1597000283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 798500121 + 798500122.

It is an arithmetic number, because the mean of its divisors is an integer number (798500122).

Almost surely, 2^1597000243 is an apocalyptic number.

1597000243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1597000243 is an equidigital number, since it uses as much as digits as its factorization.

1597000243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 1597000243 is about 39962.4854457277. The cubic root of 1597000243 is about 1168.8756927818.

The spelling of 1597000243 in words is "one billion, five hundred ninety-seven million, two hundred forty-three", and thus it is an aban number.