195428917 has 2 divisors, whose sum is σ = 195428918. Its totient is φ = 195428916.

The previous prime is 195428899. The next prime is 195428963. The reversal of 195428917 is 719824591.

It is an a-pointer prime, because the next prime (195428963) can be obtained adding 195428917 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192626641 + 2802276 = 13879^2 + 1674^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195428917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195428977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97714458 + 97714459.

It is an arithmetic number, because the mean of its divisors is an integer number (97714459).

Almost surely, 2^195428917 is an apocalyptic number.

It is an amenable number.

195428917 is a deficient number, since it is larger than the sum of its proper divisors (1).

195428917 is an equidigital number, since it uses as much as digits as its factorization.

195428917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 46.

The square root of 195428917 is about 13979.5893001189. The cubic root of 195428917 is about 580.3138580728.

The spelling of 195428917 in words is "one hundred ninety-five million, four hundred twenty-eight thousand, nine hundred seventeen".