197913761 has 2 divisors, whose sum is σ = 197913762. Its totient is φ = 197913760.

The previous prime is 197913743. The next prime is 197913763. The reversal of 197913761 is 167319791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135582736 + 62331025 = 11644^2 + 7895^2 .

It is a cyclic number.

It is not a de Polignac number, because 197913761 - 2²⁶ = 130804897 is a prime.

Together with 197913763, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (197913763) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98956880 + 98956881.

It is an arithmetic number, because the mean of its divisors is an integer number (98956881).

Almost surely, 2^197913761 is an apocalyptic number.

It is an amenable number.

197913761 is a deficient number, since it is larger than the sum of its proper divisors (1).

197913761 is an equidigital number, since it uses as much as digits as its factorization.

197913761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71442, while the sum is 44.

The square root of 197913761 is about 14068.1825762961. The cubic root of 197913761 is about 582.7630361713.

The spelling of 197913761 in words is "one hundred ninety-seven million, nine hundred thirteen thousand, seven hundred sixty-one".