64831331 has 2 divisors, whose sum is σ = 64831332. Its totient is φ = 64831330.

The previous prime is 64831313. The next prime is 64831337. The reversal of 64831331 is 13313846.

Together with previous prime (64831313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64831331 is a prime.

It is a super-2 number, since 2×64831331² = 8406202958463122, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 64831294 and 64831303.

It is not a weakly prime, because it can be changed into another prime (64831337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32415665 + 32415666.

It is an arithmetic number, because the mean of its divisors is an integer number (32415666).

Almost surely, 2^64831331 is an apocalyptic number.

64831331 is a deficient number, since it is larger than the sum of its proper divisors (1).

64831331 is an equidigital number, since it uses as much as digits as its factorization.

64831331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 29.

The square root of 64831331 is about 8051.7905462077. The cubic root of 64831331 is about 401.7244941985.

The spelling of 64831331 in words is "sixty-four million, eight hundred thirty-one thousand, three hundred thirty-one".