81106293 has 4 divisors (see below), whose sum is σ = 108141728. Its totient is φ = 54070860.

The previous prime is 81106283. The next prime is 81106309. The reversal of 81106293 is 39260118.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 81106293 - 2⁶ = 81106229 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81106293.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81106253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13517713 + ... + 13517718.

It is an arithmetic number, because the mean of its divisors is an integer number (27035432).

Almost surely, 2^81106293 is an apocalyptic number.

It is an amenable number.

81106293 is a deficient number, since it is larger than the sum of its proper divisors (27035435).

81106293 is a wasteful number, since it uses less digits than its factorization.

81106293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27035434.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 81106293 is about 9005.9032306593. The cubic root of 81106293 is about 432.8640489015.

The spelling of 81106293 in words is "eighty-one million, one hundred six thousand, two hundred ninety-three".