81117406 has 8 divisors (see below), whose sum is σ = 121714344. Its totient is φ = 40545960.

The previous prime is 81117397. The next prime is 81117409. The reversal of 81117406 is 60471118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81117409) 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, 9036 + ... + 15616.

It is an arithmetic number, because the mean of its divisors is an integer number (15214293).

Almost surely, 2^81117406 is an apocalyptic number.

81117406 is a deficient number, since it is larger than the sum of its proper divisors (40596938).

81117406 is a wasteful number, since it uses less digits than its factorization.

81117406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12746.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 81117406 is about 9006.5201937263. The cubic root of 81117406 is about 432.8838180148.

The spelling of 81117406 in words is "eighty-one million, one hundred seventeen thousand, four hundred six".