195121637 has 2 divisors, whose sum is σ = 195121638. Its totient is φ = 195121636.

The previous prime is 195121607. The next prime is 195121639. The reversal of 195121637 is 736121591.

195121637 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 174609796 + 20511841 = 13214^2 + 4529^2 .

It is a cyclic number.

It is not a de Polignac number, because 195121637 - 2¹² = 195117541 is a prime.

Together with 195121639, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 195121597 and 195121606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195121639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97560818 + 97560819.

It is an arithmetic number, because the mean of its divisors is an integer number (97560819).

Almost surely, 2^195121637 is an apocalyptic number.

It is an amenable number.

195121637 is a deficient number, since it is larger than the sum of its proper divisors (1).

195121637 is an equidigital number, since it uses as much as digits as its factorization.

195121637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 35.

The square root of 195121637 is about 13968.5946680402. The cubic root of 195121637 is about 580.0095489906.

The spelling of 195121637 in words is "one hundred ninety-five million, one hundred twenty-one thousand, six hundred thirty-seven".