64838531 has 2 divisors, whose sum is σ = 64838532. Its totient is φ = 64838530.

The previous prime is 64838509. The next prime is 64838533. The reversal of 64838531 is 13583846.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64838531 is a prime.

It is a super-2 number, since 2×64838531² = 8408070204475922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 64838533, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64838533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32419265 + 32419266.

It is an arithmetic number, because the mean of its divisors is an integer number (32419266).

Almost surely, 2^64838531 is an apocalyptic number.

64838531 is a deficient number, since it is larger than the sum of its proper divisors (1).

64838531 is an equidigital number, since it uses as much as digits as its factorization.

64838531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 38.

The square root of 64838531 is about 8052.2376393149. The cubic root of 64838531 is about 401.7393651425.

The spelling of 64838531 in words is "sixty-four million, eight hundred thirty-eight thousand, five hundred thirty-one".