64397149 has 2 divisors, whose sum is σ = 64397150. Its totient is φ = 64397148.

The previous prime is 64397147. The next prime is 64397159. The reversal of 64397149 is 94179346.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63202500 + 1194649 = 7950^2 + 1093^2 .

It is a cyclic number.

It is not a de Polignac number, because 64397149 - 2¹ = 64397147 is a prime.

Together with 64397147, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64397147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32198574 + 32198575.

It is an arithmetic number, because the mean of its divisors is an integer number (32198575).

Almost surely, 2^64397149 is an apocalyptic number.

It is an amenable number.

64397149 is a deficient number, since it is larger than the sum of its proper divisors (1).

64397149 is an equidigital number, since it uses as much as digits as its factorization.

64397149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 43.

The square root of 64397149 is about 8024.7834238688. The cubic root of 64397149 is about 400.8256881748.

It can be divided in two parts, 64397 and 149, that added together give a palindrome (64546).

The spelling of 64397149 in words is "sixty-four million, three hundred ninety-seven thousand, one hundred forty-nine".