64441997 has 2 divisors, whose sum is σ = 64441998. Its totient is φ = 64441996.

The previous prime is 64441987. The next prime is 64442009. The reversal of 64441997 is 79914446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62188996 + 2253001 = 7886^2 + 1501^2 .

It is a cyclic number.

It is not a de Polignac number, because 64441997 - 2⁶ = 64441933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64441967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32220998 + 32220999.

It is an arithmetic number, because the mean of its divisors is an integer number (32220999).

Almost surely, 2^64441997 is an apocalyptic number.

It is an amenable number.

64441997 is a deficient number, since it is larger than the sum of its proper divisors (1).

64441997 is an equidigital number, since it uses as much as digits as its factorization.

64441997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 44.

The square root of 64441997 is about 8027.5772808488. The cubic root of 64441997 is about 400.9187153730.

The spelling of 64441997 in words is "sixty-four million, four hundred forty-one thousand, nine hundred ninety-seven".