195237561 has 4 divisors (see below), whose sum is σ = 260316752. Its totient is φ = 130158372.

The previous prime is 195237557. The next prime is 195237569. The reversal of 195237561 is 165732591.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 165732591 = 3 ⋅55244197.

It is not a de Polignac number, because 195237561 - 2² = 195237557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195237569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32539591 + ... + 32539596.

It is an arithmetic number, because the mean of its divisors is an integer number (65079188).

Almost surely, 2^195237561 is an apocalyptic number.

It is an amenable number.

195237561 is a deficient number, since it is larger than the sum of its proper divisors (65079191).

195237561 is an equidigital number, since it uses as much as digits as its factorization.

195237561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65079190.

The product of its digits is 56700, while the sum is 39.

The square root of 195237561 is about 13972.7435029775. The cubic root of 195237561 is about 580.1243896903.

The spelling of 195237561 in words is "one hundred ninety-five million, two hundred thirty-seven thousand, five hundred sixty-one".