81494 has 8 divisors (see below), whose sum is σ = 139728. Its totient is φ = 34920.

The previous prime is 81463. The next prime is 81509. The reversal of 81494 is 49418.

81494 = 52² + 53² + ... + 72².

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

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2897 + ... + 2924.

It is an arithmetic number, because the mean of its divisors is an integer number (17466).

2⁸¹⁴⁹⁴ is an apocalyptic number.

81494 is a deficient number, since it is larger than the sum of its proper divisors (58234).

81494 is a wasteful number, since it uses less digits than its factorization.

81494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5830.

The product of its digits is 1152, while the sum is 26.

The square root of 81494 is about 285.4715397373. The cubic root of 81494 is about 43.3552683162.

It can be divided in two parts, 81 and 494, that added together give a palindrome (575).

The spelling of 81494 in words is "eighty-one thousand, four hundred ninety-four".