1958591 has 2 divisors, whose sum is σ = 1958592. Its totient is φ = 1958590.

The previous prime is 1958569. The next prime is 1958603.

1958591 is nontrivially palindromic in base 10.

It is a strong prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1958591 - 2¹⁴ = 1942207 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1958531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 979295 + 979296.

It is an arithmetic number, because the mean of its divisors is an integer number (979296).

2^1958591 is an apocalyptic number.

1958591 is a deficient number, since it is larger than the sum of its proper divisors (1).

1958591 is an equidigital number, since it uses as much as digits as its factorization.

1958591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 38.

The square root of 1958591 is about 1399.4966952444. The cubic root of 1958591 is about 125.1164993894.

Adding to 1958591 its product of digits (16200), we get a palindrome (1974791).

The spelling of 1958591 in words is "one million, nine hundred fifty-eight thousand, five hundred ninety-one".