64974197 has 2 divisors, whose sum is σ = 64974198. Its totient is φ = 64974196.

The previous prime is 64974191. The next prime is 64974199. The reversal of 64974197 is 79147946.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53202436 + 11771761 = 7294^2 + 3431^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64974197 is a prime.

Together with 64974199, 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 (64974191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32487098 + 32487099.

It is an arithmetic number, because the mean of its divisors is an integer number (32487099).

Almost surely, 2^64974197 is an apocalyptic number.

It is an amenable number.

64974197 is a deficient number, since it is larger than the sum of its proper divisors (1).

64974197 is an equidigital number, since it uses as much as digits as its factorization.

64974197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 47.

The square root of 64974197 is about 8060.6573553278. The cubic root of 64974197 is about 402.0193653369.

The spelling of 64974197 in words is "sixty-four million, nine hundred seventy-four thousand, one hundred ninety-seven".