81169315 has 8 divisors (see below), whose sum is σ = 100545408. Its totient is φ = 62840640.

The previous prime is 81169313. The next prime is 81169327. The reversal of 81169315 is 51396118.

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

It is not a de Polignac number, because 81169315 - 2¹ = 81169313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81169313) 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, 261682 + ... + 261991.

It is an arithmetic number, because the mean of its divisors is an integer number (12568176).

Almost surely, 2^81169315 is an apocalyptic number.

81169315 is a deficient number, since it is larger than the sum of its proper divisors (19376093).

81169315 is a wasteful number, since it uses less digits than its factorization.

81169315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523709.

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

The square root of 81169315 is about 9009.4014784557. The cubic root of 81169315 is about 432.9761359515.

The spelling of 81169315 in words is "eighty-one million, one hundred sixty-nine thousand, three hundred fifteen".