81160402 has 8 divisors (see below), whose sum is σ = 124710012. Its totient is φ = 39590400.

The previous prime is 81160369. The next prime is 81160403. The reversal of 81160402 is 20406118.

It can be written as a sum of positive squares in 2 ways, for example, as 63696361 + 17464041 = 7981^2 + 4179^2 .

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

It is not an unprimeable number, because it can be changed into a prime (81160403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494799 + ... + 494962.

Almost surely, 2^81160402 is an apocalyptic number.

81160402 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

81160402 is a deficient number, since it is larger than the sum of its proper divisors (43549610).

81160402 is a wasteful number, since it uses less digits than its factorization.

81160402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989804.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 81160402 is about 9008.9068149249. The cubic root of 81160402 is about 432.9602873616.

The spelling of 81160402 in words is "eighty-one million, one hundred sixty thousand, four hundred two".