81345113 has 2 divisors, whose sum is σ = 81345114. Its totient is φ = 81345112.

The previous prime is 81345067. The next prime is 81345127. The reversal of 81345113 is 31154318.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69839449 + 11505664 = 8357^2 + 3392^2 .

It is a cyclic number.

It is not a de Polignac number, because 81345113 - 2⁶ = 81345049 is a prime.

It is not a weakly prime, because it can be changed into another prime (81345133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40672556 + 40672557.

It is an arithmetic number, because the mean of its divisors is an integer number (40672557).

Almost surely, 2^81345113 is an apocalyptic number.

It is an amenable number.

81345113 is a deficient number, since it is larger than the sum of its proper divisors (1).

81345113 is an equidigital number, since it uses as much as digits as its factorization.

81345113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 26.

The square root of 81345113 is about 9019.1525655130. The cubic root of 81345113 is about 433.2884931248.

The spelling of 81345113 in words is "eighty-one million, three hundred forty-five thousand, one hundred thirteen".