81165454 has 8 divisors (see below), whose sum is σ = 128156040. Its totient is φ = 38446776.

The previous prime is 81165449. The next prime is 81165479. The reversal of 81165454 is 45456118.

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

It is a super-2 number, since 2×81165454² = 13175661846052232, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1067929 + ... + 1068004.

It is an arithmetic number, because the mean of its divisors is an integer number (16019505).

Almost surely, 2^81165454 is an apocalyptic number.

81165454 is a deficient number, since it is larger than the sum of its proper divisors (46990586).

81165454 is a wasteful number, since it uses less digits than its factorization.

81165454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135954.

The product of its digits is 19200, while the sum is 34.

The square root of 81165454 is about 9009.1871997423. The cubic root of 81165454 is about 432.9692706832.

The spelling of 81165454 in words is "eighty-one million, one hundred sixty-five thousand, four hundred fifty-four".