81034249 has 2 divisors, whose sum is σ = 81034250. Its totient is φ = 81034248.

The previous prime is 81034241. The next prime is 81034253. The reversal of 81034249 is 94243018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51222649 + 29811600 = 7157^2 + 5460^2 .

It is a cyclic number.

It is not a de Polignac number, because 81034249 - 2³ = 81034241 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81034249.

It is not a weakly prime, because it can be changed into another prime (81034241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40517124 + 40517125.

It is an arithmetic number, because the mean of its divisors is an integer number (40517125).

Almost surely, 2^81034249 is an apocalyptic number.

It is an amenable number.

81034249 is a deficient number, since it is larger than the sum of its proper divisors (1).

81034249 is an equidigital number, since it uses as much as digits as its factorization.

81034249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 81034249 is about 9001.9025211341. The cubic root of 81034249 is about 432.7358447283.

The spelling of 81034249 in words is "eighty-one million, thirty-four thousand, two hundred forty-nine".