1591313 has 2 divisors, whose sum is σ = 1591314. Its totient is φ = 1591312.

The previous prime is 1591277. The next prime is 1591339. The reversal of 1591313 is 3131951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1481089 + 110224 = 1217^2 + 332^2 .

It is an emirp because it is prime and its reverse (3131951) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1591313 is a prime.

It is not a weakly prime, because it can be changed into another prime (1591363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 795656 + 795657.

It is an arithmetic number, because the mean of its divisors is an integer number (795657).

2^1591313 is an apocalyptic number.

It is an amenable number.

1591313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1591313 is an equidigital number, since it uses as much as digits as its factorization.

1591313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 405, while the sum is 23.

The square root of 1591313 is about 1261.4725522182. The cubic root of 1591313 is about 116.7486507646.

The spelling of 1591313 in words is "one million, five hundred ninety-one thousand, three hundred thirteen".