81150794 has 4 divisors (see below), whose sum is σ = 121726194. Its totient is φ = 40575396.

The previous prime is 81150793. The next prime is 81150803. The reversal of 81150794 is 49705118.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 41925625 + 39225169 = 6475^2 + 6263^2 .

It is not an unprimeable number, because it can be changed into a prime (81150793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20287697 + ... + 20287700.

Almost surely, 2^81150794 is an apocalyptic number.

81150794 is a deficient number, since it is larger than the sum of its proper divisors (40575400).

81150794 is a wasteful number, since it uses less digits than its factorization.

81150794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40575399.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 81150794 is about 9008.3735490931. The cubic root of 81150794 is about 432.9432016626.

The spelling of 81150794 in words is "eighty-one million, one hundred fifty thousand, seven hundred ninety-four".