81155410 has 32 divisors (see below), whose sum is σ = 167334912. Its totient is φ = 27760320.

The previous prime is 81155407. The next prime is 81155411. The reversal of 81155410 is 1455118.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81155411) 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 15 ways as a sum of consecutive naturals, for example, 36799 + ... + 38941.

It is an arithmetic number, because the mean of its divisors is an integer number (5229216).

Almost surely, 2^81155410 is an apocalyptic number.

81155410 is an abundant number, since it is smaller than the sum of its proper divisors (86179502).

81155410 is a wasteful number, since it uses less digits than its factorization.

81155410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2698.

The product of its (nonzero) digits is 800, while the sum is 25.

The square root of 81155410 is about 9008.6297515216. The cubic root of 81155410 is about 432.9514103641.

The spelling of 81155410 in words is "eighty-one million, one hundred fifty-five thousand, four hundred ten".