195831260621 has 2 divisors, whose sum is σ = 195831260622. Its totient is φ = 195831260620.

The previous prime is 195831260591. The next prime is 195831260633. The reversal of 195831260621 is 126062138591.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113511043396 + 82320217225 = 336914^2 + 286915^2 .

It is a cyclic number.

It is not a de Polignac number, because 195831260621 - 2⁶ = 195831260557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195831260641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97915630310 + 97915630311.

It is an arithmetic number, because the mean of its divisors is an integer number (97915630311).

Almost surely, 2^195831260621 is an apocalyptic number.

It is an amenable number.

195831260621 is a deficient number, since it is larger than the sum of its proper divisors (1).

195831260621 is an equidigital number, since it uses as much as digits as its factorization.

195831260621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 195831260621 in words is "one hundred ninety-five billion, eight hundred thirty-one million, two hundred sixty thousand, six hundred twenty-one".