81873061 has 16 divisors (see below), whose sum is σ = 87120000. Its totient is φ = 76821696.

The previous prime is 81873059. The next prime is 81873067. The reversal of 81873061 is 16037818.

It is not a de Polignac number, because 81873061 - 2¹ = 81873059 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81873067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186280 + ... + 186718.

It is an arithmetic number, because the mean of its divisors is an integer number (5445000).

Almost surely, 2^81873061 is an apocalyptic number.

It is an amenable number.

81873061 is a deficient number, since it is larger than the sum of its proper divisors (5246939).

81873061 is a wasteful number, since it uses less digits than its factorization.

81873061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 81873061 is about 9048.3733897314. The cubic root of 81873061 is about 434.2238522546.

The spelling of 81873061 in words is "eighty-one million, eight hundred seventy-three thousand, sixty-one".