81168429 has 8 divisors (see below), whose sum is σ = 109275712. Its totient is φ = 53586720.

The previous prime is 81168413. The next prime is 81168431. The reversal of 81168429 is 92486118.

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

It is not a de Polignac number, because 81168429 - 2⁴ = 81168413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81168929) 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, 131032 + ... + 131649.

It is an arithmetic number, because the mean of its divisors is an integer number (13659464).

Almost surely, 2^81168429 is an apocalyptic number.

It is an amenable number.

81168429 is a deficient number, since it is larger than the sum of its proper divisors (28107283).

81168429 is a wasteful number, since it uses less digits than its factorization.

81168429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262787.

The product of its digits is 27648, while the sum is 39.

The square root of 81168429 is about 9009.3523074636. The cubic root of 81168429 is about 432.9745605686.

The spelling of 81168429 in words is "eighty-one million, one hundred sixty-eight thousand, four hundred twenty-nine".