81394901 has 4 divisors (see below), whose sum is σ = 93022752. Its totient is φ = 69767052.

The previous prime is 81394891. The next prime is 81394903. The reversal of 81394901 is 10949318.

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 a cyclic number.

It is not a de Polignac number, because 81394901 - 2⁶ = 81394837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81394903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5813915 + ... + 5813928.

It is an arithmetic number, because the mean of its divisors is an integer number (23255688).

Almost surely, 2^81394901 is an apocalyptic number.

It is an amenable number.

81394901 is a deficient number, since it is larger than the sum of its proper divisors (11627851).

81394901 is a wasteful number, since it uses less digits than its factorization.

81394901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11627850.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 81394901 is about 9021.9122695801. The cubic root of 81394901 is about 433.3768744546.

The spelling of 81394901 in words is "eighty-one million, three hundred ninety-four thousand, nine hundred one".