81976603 has 2 divisors, whose sum is σ = 81976604. Its totient is φ = 81976602.

The previous prime is 81976579. The next prime is 81976613. The reversal of 81976603 is 30667918.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81976603 is a prime.

It is not a weakly prime, because it can be changed into another prime (81976613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40988301 + 40988302.

It is an arithmetic number, because the mean of its divisors is an integer number (40988302).

Almost surely, 2^81976603 is an apocalyptic number.

81976603 is a deficient number, since it is larger than the sum of its proper divisors (1).

81976603 is an equidigital number, since it uses as much as digits as its factorization.

81976603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 81976603 is about 9054.0931627635. The cubic root of 81976603 is about 434.4068243888.

The spelling of 81976603 in words is "eighty-one million, nine hundred seventy-six thousand, six hundred three".