81229963 has 2 divisors, whose sum is σ = 81229964. Its totient is φ = 81229962.

The previous prime is 81229949. The next prime is 81229987. The reversal of 81229963 is 36992218.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81229963 is a prime.

It is not a weakly prime, because it can be changed into another prime (81229913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40614981 + 40614982.

It is an arithmetic number, because the mean of its divisors is an integer number (40614982).

Almost surely, 2^81229963 is an apocalyptic number.

81229963 is a deficient number, since it is larger than the sum of its proper divisors (1).

81229963 is an equidigital number, since it uses as much as digits as its factorization.

81229963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 40.

The square root of 81229963 is about 9012.7666673447. The cubic root of 81229963 is about 433.0839459834.

The spelling of 81229963 in words is "eighty-one million, two hundred twenty-nine thousand, nine hundred sixty-three".