81074199 has 8 divisors (see below), whose sum is σ = 108445552. Its totient is φ = 53876160.

The previous prime is 81074183. The next prime is 81074243. The reversal of 81074199 is 99147018.

It is a happy number.

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

It is not a de Polignac number, because 81074199 - 2⁴ = 81074183 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 (81074099) 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, 42232 + ... + 44109.

It is an arithmetic number, because the mean of its divisors is an integer number (13555694).

Almost surely, 2^81074199 is an apocalyptic number.

81074199 is a deficient number, since it is larger than the sum of its proper divisors (27371353).

81074199 is a wasteful number, since it uses less digits than its factorization.

81074199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86657.

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 81074199 is about 9004.1212230845. The cubic root of 81074199 is about 432.8069461742.

The spelling of 81074199 in words is "eighty-one million, seventy-four thousand, one hundred ninety-nine".