64211969 has 2 divisors, whose sum is σ = 64211970. Its totient is φ = 64211968.

The previous prime is 64211947. The next prime is 64211981. The reversal of 64211969 is 96911246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56851600 + 7360369 = 7540^2 + 2713^2 .

It is a cyclic number.

It is not a de Polignac number, because 64211969 - 2¹² = 64207873 is a prime.

It is a super-2 number, since 2×64211969² = 8246353925713922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64211989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32105984 + 32105985.

It is an arithmetic number, because the mean of its divisors is an integer number (32105985).

Almost surely, 2^64211969 is an apocalyptic number.

It is an amenable number.

64211969 is a deficient number, since it is larger than the sum of its proper divisors (1).

64211969 is an equidigital number, since it uses as much as digits as its factorization.

64211969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 38.

The square root of 64211969 is about 8013.2371111805. The cubic root of 64211969 is about 400.4411154474.

The spelling of 64211969 in words is "sixty-four million, two hundred eleven thousand, nine hundred sixty-nine".