64911421 has 2 divisors, whose sum is σ = 64911422. Its totient is φ = 64911420.

The previous prime is 64911383. The next prime is 64911433. The reversal of 64911421 is 12411946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59505796 + 5405625 = 7714^2 + 2325^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64911421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64911421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64911521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32455710 + 32455711.

It is an arithmetic number, because the mean of its divisors is an integer number (32455711).

Almost surely, 2^64911421 is an apocalyptic number.

It is an amenable number.

64911421 is a deficient number, since it is larger than the sum of its proper divisors (1).

64911421 is an equidigital number, since it uses as much as digits as its factorization.

64911421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 28.

The square root of 64911421 is about 8056.7624390943. The cubic root of 64911421 is about 401.8898508476.

The spelling of 64911421 in words is "sixty-four million, nine hundred eleven thousand, four hundred twenty-one".