81314431 has 8 divisors (see below), whose sum is σ = 89198928. Its totient is φ = 73512000.

The previous prime is 81314411. The next prime is 81314459. The reversal of 81314431 is 13441318.

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

It is a cyclic number.

It is not a de Polignac number, because 81314431 - 2⁵ = 81314399 is a prime.

It is a super-2 number, since 2×81314431² = 13224073377707522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81314396 and 81314405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81314411) 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, 18430 + ... + 22411.

It is an arithmetic number, because the mean of its divisors is an integer number (11149866).

Almost surely, 2^81314431 is an apocalyptic number.

81314431 is a deficient number, since it is larger than the sum of its proper divisors (7884497).

81314431 is a wasteful number, since it uses less digits than its factorization.

81314431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41033.

The product of its digits is 1152, while the sum is 25.

The square root of 81314431 is about 9017.4514692345. The cubic root of 81314431 is about 433.2340099119.

Adding to 81314431 its reverse (13441318), we get a palindrome (94755749).

The spelling of 81314431 in words is "eighty-one million, three hundred fourteen thousand, four hundred thirty-one".