195772491 has 8 divisors (see below), whose sum is σ = 290033360. Its totient is φ = 130514976.

The previous prime is 195772483. The next prime is 195772501. The reversal of 195772491 is 194277591.

195772491 is a `hidden beast` number, since 1 + 95 + 7 + 72 + 491 = 666.

It is not a de Polignac number, because 195772491 - 2³ = 195772483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195772411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3625390 + ... + 3625443.

It is an arithmetic number, because the mean of its divisors is an integer number (36254170).

Almost surely, 2^195772491 is an apocalyptic number.

195772491 is a deficient number, since it is larger than the sum of its proper divisors (94260869).

195772491 is an equidigital number, since it uses as much as digits as its factorization.

195772491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7250842 (or 7250836 counting only the distinct ones).

The product of its digits is 158760, while the sum is 45.

The square root of 195772491 is about 13991.8723193145. The cubic root of 195772491 is about 580.6537327615.

The spelling of 195772491 in words is "one hundred ninety-five million, seven hundred seventy-two thousand, four hundred ninety-one".