1591230997 has 2 divisors, whose sum is σ = 1591230998. Its totient is φ = 1591230996.

The previous prime is 1591230973. The next prime is 1591231001. The reversal of 1591230997 is 7990321951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1269781956 + 321449041 = 35634^2 + 17929^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1591230997 is a prime.

It is a super-2 number, since 2×1591230997² = 5064032171627228018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1591230097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 795615498 + 795615499.

It is an arithmetic number, because the mean of its divisors is an integer number (795615499).

Almost surely, 2^1591230997 is an apocalyptic number.

It is an amenable number.

1591230997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1591230997 is an equidigital number, since it uses as much as digits as its factorization.

1591230997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 153090, while the sum is 46.

The square root of 1591230997 is about 39890.2368631724. The cubic root of 1591230997 is about 1167.4664531290.

The spelling of 1591230997 in words is "one billion, five hundred ninety-one million, two hundred thirty thousand, nine hundred ninety-seven".