195411989 has 2 divisors, whose sum is σ = 195411990. Its totient is φ = 195411988.

The previous prime is 195411971. The next prime is 195412031. The reversal of 195411989 is 989114591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190716100 + 4695889 = 13810^2 + 2167^2 .

It is a cyclic number.

It is not a de Polignac number, because 195411989 - 2²⁰ = 194363413 is a prime.

It is a super-2 number, since 2×195411989² = 76371690889872242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195411919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97705994 + 97705995.

It is an arithmetic number, because the mean of its divisors is an integer number (97705995).

Almost surely, 2^195411989 is an apocalyptic number.

It is an amenable number.

195411989 is a deficient number, since it is larger than the sum of its proper divisors (1).

195411989 is an equidigital number, since it uses as much as digits as its factorization.

195411989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 47.

The square root of 195411989 is about 13978.9838328828. The cubic root of 195411989 is about 580.2971020458.

The spelling of 195411989 in words is "one hundred ninety-five million, four hundred eleven thousand, nine hundred eighty-nine".