81169427 has 8 divisors (see below), whose sum is σ = 82874880. Its totient is φ = 79475080.

The previous prime is 81169421. The next prime is 81169433. The reversal of 81169427 is 72496118.

It is an interprime number because it is at equal distance from previous prime (81169421) and next prime (81169433).

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 81169427 - 2⁴ = 81169411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81169421) 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, 12902 + ... + 18132.

It is an arithmetic number, because the mean of its divisors is an integer number (10359360).

Almost surely, 2^81169427 is an apocalyptic number.

81169427 is a deficient number, since it is larger than the sum of its proper divisors (1705453).

81169427 is a wasteful number, since it uses less digits than its factorization.

81169427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5553.

The product of its digits is 24192, while the sum is 38.

The square root of 81169427 is about 9009.4076941828. The cubic root of 81169427 is about 432.9763350962.

The spelling of 81169427 in words is "eighty-one million, one hundred sixty-nine thousand, four hundred twenty-seven".