64291897 has 2 divisors, whose sum is σ = 64291898. Its totient is φ = 64291896.

The previous prime is 64291873. The next prime is 64291907. The reversal of 64291897 is 79819246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44675856 + 19616041 = 6684^2 + 4429^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64291897 is a prime.

It is not a weakly prime, because it can be changed into another prime (64291847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32145948 + 32145949.

It is an arithmetic number, because the mean of its divisors is an integer number (32145949).

Almost surely, 2^64291897 is an apocalyptic number.

It is an amenable number.

64291897 is a deficient number, since it is larger than the sum of its proper divisors (1).

64291897 is an equidigital number, since it uses as much as digits as its factorization.

64291897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 46.

The square root of 64291897 is about 8018.2228080791. Note that the first 3 decimals coincide. The cubic root of 64291897 is about 400.6071965644.

The spelling of 64291897 in words is "sixty-four million, two hundred ninety-one thousand, eight hundred ninety-seven".