81463667 has 2 divisors, whose sum is σ = 81463668. Its totient is φ = 81463666.

The previous prime is 81463619. The next prime is 81463687. The reversal of 81463667 is 76636418.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81463667 - 2¹² = 81459571 is a prime.

It is not a weakly prime, because it can be changed into another prime (81463687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40731833 + 40731834.

It is an arithmetic number, because the mean of its divisors is an integer number (40731834).

Almost surely, 2^81463667 is an apocalyptic number.

81463667 is a deficient number, since it is larger than the sum of its proper divisors (1).

81463667 is an equidigital number, since it uses as much as digits as its factorization.

81463667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 41.

The square root of 81463667 is about 9025.7225195549. The cubic root of 81463667 is about 433.4988853961.

The spelling of 81463667 in words is "eighty-one million, four hundred sixty-three thousand, six hundred sixty-seven".