81394977 has 8 divisors (see below), whose sum is σ = 108569440. Its totient is φ = 54241920.

The previous prime is 81394969. The next prime is 81394979. The reversal of 81394977 is 77949318.

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

It is not a de Polignac number, because 81394977 - 2³ = 81394969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81394979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9102 + ... + 15672.

It is an arithmetic number, because the mean of its divisors is an integer number (13571180).

Almost surely, 2^81394977 is an apocalyptic number.

It is an amenable number.

81394977 is a deficient number, since it is larger than the sum of its proper divisors (27174463).

81394977 is a wasteful number, since it uses less digits than its factorization.

81394977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10703.

The product of its digits is 381024, while the sum is 48.

The square root of 81394977 is about 9021.9164815465. The cubic root of 81394977 is about 433.3770093387.

The spelling of 81394977 in words is "eighty-one million, three hundred ninety-four thousand, nine hundred seventy-seven".