81094457 has 2 divisors, whose sum is σ = 81094458. Its totient is φ = 81094456.

The previous prime is 81094427. The next prime is 81094477. The reversal of 81094457 is 75449018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72863296 + 8231161 = 8536^2 + 2869^2 .

It is a cyclic number.

It is not a de Polignac number, because 81094457 - 2⁶ = 81094393 is a prime.

It is a super-2 number, since 2×81094457² = 13152621912249698, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81094457.

It is not a weakly prime, because it can be changed into another prime (81094427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40547228 + 40547229.

It is an arithmetic number, because the mean of its divisors is an integer number (40547229).

Almost surely, 2^81094457 is an apocalyptic number.

It is an amenable number.

81094457 is a deficient number, since it is larger than the sum of its proper divisors (1).

81094457 is an equidigital number, since it uses as much as digits as its factorization.

81094457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 81094457 is about 9005.2460821457. The cubic root of 81094457 is about 432.8429916447.

The spelling of 81094457 in words is "eighty-one million, ninety-four thousand, four hundred fifty-seven".