81494499 has 8 divisors (see below), whose sum is σ = 110148112. Its totient is φ = 53585280.

The previous prime is 81494489. The next prime is 81494509. The reversal of 81494499 is 99449418.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81494489) and next prime (81494509).

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

It is a de Polignac number, because none of the positive numbers 2^k-81494499 is a prime.

It is a super-2 number, since 2×81494499² = 13282706734522002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81494419) 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, 185842 + ... + 186279.

It is an arithmetic number, because the mean of its divisors is an integer number (13768514).

Almost surely, 2^81494499 is an apocalyptic number.

81494499 is a deficient number, since it is larger than the sum of its proper divisors (28653613).

81494499 is a wasteful number, since it uses less digits than its factorization.

81494499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372197.

The product of its digits is 373248, while the sum is 48.

The square root of 81494499 is about 9027.4303652811. The cubic root of 81494499 is about 433.5535680634.

The spelling of 81494499 in words is "eighty-one million, four hundred ninety-four thousand, four hundred ninety-nine".