81055745 has 16 divisors (see below), whose sum is σ = 103223808. Its totient is φ = 60890880.

The previous prime is 81055739. The next prime is 81055759. The reversal of 81055745 is 54755018.

It is a de Polignac number, because none of the positive numbers 2^k-81055745 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50810 + ... + 52380.

It is an arithmetic number, because the mean of its divisors is an integer number (6451488).

Almost surely, 2^81055745 is an apocalyptic number.

81055745 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

81055745 is a deficient number, since it is larger than the sum of its proper divisors (22168063).

81055745 is a wasteful number, since it uses less digits than its factorization.

81055745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2200.

The product of its (nonzero) digits is 28000, while the sum is 35.

The square root of 81055745 is about 9003.0964117908. The cubic root of 81055745 is about 432.7741053709.

Adding to 81055745 its product of nonzero digits (28000), we get a triangular number (81083745 = T₁₂₇₃₄).

The spelling of 81055745 in words is "eighty-one million, fifty-five thousand, seven hundred forty-five".