81154636 has 12 divisors (see below), whose sum is σ = 142394112. Its totient is φ = 40470608.

The previous prime is 81154589. The next prime is 81154637. The reversal of 81154636 is 63645118.

It is a happy number.

It is a super-3 number, since 3×81154636³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (81154637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24955 + ... + 28018.

It is an arithmetic number, because the mean of its divisors is an integer number (11866176).

Almost surely, 2^81154636 is an apocalyptic number.

It is an amenable number.

81154636 is a deficient number, since it is larger than the sum of its proper divisors (61239476).

81154636 is a wasteful number, since it uses less digits than its factorization.

81154636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53360 (or 53358 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 81154636 is about 9008.5867926107. The cubic root of 81154636 is about 432.9500339701.

The spelling of 81154636 in words is "eighty-one million, one hundred fifty-four thousand, six hundred thirty-six".