195958489 has 2 divisors, whose sum is σ = 195958490. Its totient is φ = 195958488.

The previous prime is 195958487. The next prime is 195958493. The reversal of 195958489 is 984859591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183142089 + 12816400 = 13533^2 + 3580^2 .

It is a cyclic number.

It is not a de Polignac number, because 195958489 - 2¹ = 195958487 is a prime.

It is a super-2 number, since 2×195958489² = 76799458822326242, which contains 22 as substring.

Together with 195958487, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (195958487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97979244 + 97979245.

It is an arithmetic number, because the mean of its divisors is an integer number (97979245).

Almost surely, 2^195958489 is an apocalyptic number.

It is an amenable number.

195958489 is a deficient number, since it is larger than the sum of its proper divisors (1).

195958489 is an equidigital number, since it uses as much as digits as its factorization.

195958489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4665600, while the sum is 58.

The square root of 195958489 is about 13998.5173857805. The cubic root of 195958489 is about 580.8375622119.

The spelling of 195958489 in words is "one hundred ninety-five million, nine hundred fifty-eight thousand, four hundred eighty-nine".