81145910 has 16 divisors (see below), whose sum is σ = 150774912. Its totient is φ = 31411200.

The previous prime is 81145907. The next prime is 81145937. The reversal of 81145910 is 1954118.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130571 + ... + 131190.

It is an arithmetic number, because the mean of its divisors is an integer number (9423432).

Almost surely, 2^81145910 is an apocalyptic number.

81145910 is a deficient number, since it is larger than the sum of its proper divisors (69629002).

81145910 is a wasteful number, since it uses less digits than its factorization.

81145910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261799.

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 81145910 is about 9008.1024638933. The cubic root of 81145910 is about 432.9345160338.

The spelling of 81145910 in words is "eighty-one million, one hundred forty-five thousand, nine hundred ten".