81093413 has 2 divisors, whose sum is σ = 81093414. Its totient is φ = 81093412.

The previous prime is 81093409. The next prime is 81093457. The reversal of 81093413 is 31439018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57259489 + 23833924 = 7567^2 + 4882^2 .

It is a cyclic number.

It is not a de Polignac number, because 81093413 - 2² = 81093409 is a prime.

It is a super-2 number, since 2×81093413² = 13152283263977138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81093403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40546706 + 40546707.

It is an arithmetic number, because the mean of its divisors is an integer number (40546707).

Almost surely, 2^81093413 is an apocalyptic number.

It is an amenable number.

81093413 is a deficient number, since it is larger than the sum of its proper divisors (1).

81093413 is an equidigital number, since it uses as much as digits as its factorization.

81093413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 81093413 is about 9005.1881157475. The cubic root of 81093413 is about 432.8411341810.

The spelling of 81093413 in words is "eighty-one million, ninety-three thousand, four hundred thirteen".