81494039 has 16 divisors (see below), whose sum is σ = 94849056. Its totient is φ = 69196800.

The previous prime is 81494033. The next prime is 81494051. The reversal of 81494039 is 93049418.

It is a de Polignac number, because none of the positive numbers 2^k-81494039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81493993 and 81494011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81494033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24029 + ... + 27209.

It is an arithmetic number, because the mean of its divisors is an integer number (5928066).

Almost surely, 2^81494039 is an apocalyptic number.

81494039 is a deficient number, since it is larger than the sum of its proper divisors (13355017).

81494039 is a wasteful number, since it uses less digits than its factorization.

81494039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3346.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 81494039 is about 9027.4048873417. The cubic root of 81494039 is about 433.5527523232.

The spelling of 81494039 in words is "eighty-one million, four hundred ninety-four thousand, thirty-nine".