81872467 has 2 divisors, whose sum is σ = 81872468. Its totient is φ = 81872466.

The previous prime is 81872447. The next prime is 81872477. The reversal of 81872467 is 76427818.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81872467 - 2⁷ = 81872339 is a prime.

It is not a weakly prime, because it can be changed into another prime (81872437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40936233 + 40936234.

It is an arithmetic number, because the mean of its divisors is an integer number (40936234).

Almost surely, 2^81872467 is an apocalyptic number.

81872467 is a deficient number, since it is larger than the sum of its proper divisors (1).

81872467 is an equidigital number, since it uses as much as digits as its factorization.

81872467 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150528, while the sum is 43.

The square root of 81872467 is about 9048.3405660928. The cubic root of 81872467 is about 434.2228021347. Note that the first 3 decimals are identical.

The spelling of 81872467 in words is "eighty-one million, eight hundred seventy-two thousand, four hundred sixty-seven".