81763567 has 2 divisors, whose sum is σ = 81763568. Its totient is φ = 81763566.

The previous prime is 81763547. The next prime is 81763589. The reversal of 81763567 is 76536718.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81763567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81763537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40881783 + 40881784.

It is an arithmetic number, because the mean of its divisors is an integer number (40881784).

Almost surely, 2^81763567 is an apocalyptic number.

81763567 is a deficient number, since it is larger than the sum of its proper divisors (1).

81763567 is an equidigital number, since it uses as much as digits as its factorization.

81763567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 43.

The square root of 81763567 is about 9042.3208857019. The cubic root of 81763567 is about 434.0301942650.

The spelling of 81763567 in words is "eighty-one million, seven hundred sixty-three thousand, five hundred sixty-seven".