81617467 has 2 divisors, whose sum is σ = 81617468. Its totient is φ = 81617466.

The previous prime is 81617453. The next prime is 81617477. The reversal of 81617467 is 76471618.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81617467 is a prime.

It is a super-2 number, since 2×81617467² = 13322821838992178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81617447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40808733 + 40808734.

It is an arithmetic number, because the mean of its divisors is an integer number (40808734).

Almost surely, 2^81617467 is an apocalyptic number.

81617467 is a deficient number, since it is larger than the sum of its proper divisors (1).

81617467 is an equidigital number, since it uses as much as digits as its factorization.

81617467 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 40.

The square root of 81617467 is about 9034.2385954767. The cubic root of 81617467 is about 433.7715231536.

The spelling of 81617467 in words is "eighty-one million, six hundred seventeen thousand, four hundred sixty-seven".