81314120 has 16 divisors (see below), whose sum is σ = 182956860. Its totient is φ = 32525632.

The previous prime is 81314119. The next prime is 81314141. The reversal of 81314120 is 2141318.

It can be written as a sum of positive squares in 2 ways, for example, as 77757124 + 3556996 = 8818^2 + 1886^2 .

It is a super-2 number, since 2×81314120² = 13223972222748800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 81314092 and 81314101.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1016387 + ... + 1016466.

Almost surely, 2^81314120 is an apocalyptic number.

It is an amenable number.

81314120 is an abundant number, since it is smaller than the sum of its proper divisors (101642740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81314120 is a wasteful number, since it uses less digits than its factorization.

81314120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2032864 (or 2032860 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 81314120 is about 9017.4342248779. The cubic root of 81314120 is about 433.2334575870.

Adding to 81314120 its reverse (2141318), we get a palindrome (83455438).

The spelling of 81314120 in words is "eighty-one million, three hundred fourteen thousand, one hundred twenty".