81071170 has 8 divisors (see below), whose sum is σ = 145928124. Its totient is φ = 32428464.

The previous prime is 81071149. The next prime is 81071173. The reversal of 81071170 is 7117018.

It can be written as a sum of positive squares in 2 ways, for example, as 81054009 + 17161 = 9003^2 + 131^2 .

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 (81071173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4053549 + ... + 4053568.

Almost surely, 2^81071170 is an apocalyptic number.

81071170 is a deficient number, since it is larger than the sum of its proper divisors (64856954).

81071170 is a wasteful number, since it uses less digits than its factorization.

81071170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8107124.

The product of its (nonzero) digits is 392, while the sum is 25.

The square root of 81071170 is about 9003.9530207570. The cubic root of 81071170 is about 432.8015560970.

Adding to 81071170 its reverse (7117018), we get a palindrome (88188188).

It can be divided in two parts, 8107 and 1170, that multiplied together give a triangular number (9485190 = T₄₃₅₅).

The spelling of 81071170 in words is "eighty-one million, seventy-one thousand, one hundred seventy".