81169351 has 8 divisors (see below), whose sum is σ = 81954000. Its totient is φ = 80388672.

The previous prime is 81169331. The next prime is 81169391. The reversal of 81169351 is 15396118.

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 81169351 - 2⁹ = 81168839 is a prime.

It is a super-2 number, since 2×81169351² = 13176927083522402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81169331) 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, 53400 + ... + 54898.

It is an arithmetic number, because the mean of its divisors is an integer number (10244250).

Almost surely, 2^81169351 is an apocalyptic number.

81169351 is a deficient number, since it is larger than the sum of its proper divisors (784649).

81169351 is a wasteful number, since it uses less digits than its factorization.

81169351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1985.

The product of its digits is 6480, while the sum is 34.

The square root of 81169351 is about 9009.4034763685. The cubic root of 81169351 is about 432.9761999623.

The spelling of 81169351 in words is "eighty-one million, one hundred sixty-nine thousand, three hundred fifty-one".