81154611 has 24 divisors (see below), whose sum is σ = 120103776. Its totient is φ = 52790400.

The previous prime is 81154589. The next prime is 81154637. The reversal of 81154611 is 11645118.

It is not a de Polignac number, because 81154611 - 2⁶ = 81154547 is a prime.

It is a super-2 number, since 2×81154611² = 13172141773122642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81154691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65746 + ... + 66968.

It is an arithmetic number, because the mean of its divisors is an integer number (5004324).

Almost surely, 2^81154611 is an apocalyptic number.

81154611 is a deficient number, since it is larger than the sum of its proper divisors (38949165).

81154611 is a wasteful number, since it uses less digits than its factorization.

81154611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1403 (or 1400 counting only the distinct ones).

The product of its digits is 960, while the sum is 27.

The square root of 81154611 is about 9008.5854050456. The cubic root of 81154611 is about 432.9499895127.

Adding to 81154611 its reverse (11645118), we get a palindrome (92799729).

The spelling of 81154611 in words is "eighty-one million, one hundred fifty-four thousand, six hundred eleven".