64999481 has 2 divisors, whose sum is σ = 64999482. Its totient is φ = 64999480.

The previous prime is 64999477. The next prime is 64999523. The reversal of 64999481 is 18499946.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58003456 + 6996025 = 7616^2 + 2645^2 .

It is a cyclic number.

It is not a de Polignac number, because 64999481 - 2² = 64999477 is a prime.

It is a super-2 number, since 2×64999481² = 8449865060538722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (64999421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32499740 + 32499741.

It is an arithmetic number, because the mean of its divisors is an integer number (32499741).

Almost surely, 2^64999481 is an apocalyptic number.

It is an amenable number.

64999481 is a deficient number, since it is larger than the sum of its proper divisors (1).

64999481 is an equidigital number, since it uses as much as digits as its factorization.

64999481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 50.

The square root of 64999481 is about 8062.2255612207. The cubic root of 64999481 is about 402.0715057244.

The spelling of 64999481 in words is "sixty-four million, nine hundred ninety-nine thousand, four hundred eighty-one".