197474621 has 2 divisors, whose sum is σ = 197474622. Its totient is φ = 197474620.

The previous prime is 197474611. The next prime is 197474623. The reversal of 197474621 is 126474791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 174530521 + 22944100 = 13211^2 + 4790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197474621 is a prime.

Together with 197474623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197474623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98737310 + 98737311.

It is an arithmetic number, because the mean of its divisors is an integer number (98737311).

Almost surely, 2^197474621 is an apocalyptic number.

It is an amenable number.

197474621 is a deficient number, since it is larger than the sum of its proper divisors (1).

197474621 is an equidigital number, since it uses as much as digits as its factorization.

197474621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 41.

The square root of 197474621 is about 14052.5663492474. The cubic root of 197474621 is about 582.3316966654.

The spelling of 197474621 in words is "one hundred ninety-seven million, four hundred seventy-four thousand, six hundred twenty-one".