81002494 has 8 divisors (see below), whose sum is σ = 121553640. Its totient is φ = 40484616.

The previous prime is 81002489. The next prime is 81002503. The reversal of 81002494 is 49420018.

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

It is a super-2 number, since 2×81002494² = 13122808068440072, which contains 22 as substring.

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, 909 + ... + 12760.

It is an arithmetic number, because the mean of its divisors is an integer number (15194205).

Almost surely, 2^81002494 is an apocalyptic number.

81002494 is a deficient number, since it is larger than the sum of its proper divisors (40551146).

81002494 is a wasteful number, since it uses less digits than its factorization.

81002494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16634.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 81002494 is about 9000.1385544890. The cubic root of 81002494 is about 432.6793117509.

The spelling of 81002494 in words is "eighty-one million, two thousand, four hundred ninety-four".