195147009517 has 2 divisors, whose sum is σ = 195147009518. Its totient is φ = 195147009516.

The previous prime is 195147009493. The next prime is 195147009553. The reversal of 195147009517 is 715900741591.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163943200201 + 31203809316 = 404899^2 + 176646^2 .

It is a cyclic number.

It is not a de Polignac number, because 195147009517 - 2¹⁹ = 195146485229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195147009557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97573504758 + 97573504759.

It is an arithmetic number, because the mean of its divisors is an integer number (97573504759).

Almost surely, 2^195147009517 is an apocalyptic number.

It is an amenable number.

195147009517 is a deficient number, since it is larger than the sum of its proper divisors (1).

195147009517 is an equidigital number, since it uses as much as digits as its factorization.

195147009517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 396900, while the sum is 49.

The spelling of 195147009517 in words is "one hundred ninety-five billion, one hundred forty-seven million, nine thousand, five hundred seventeen".