81473187 has 8 divisors (see below), whose sum is σ = 109177600. Its totient is φ = 54042120.

The previous prime is 81473173. The next prime is 81473201. The reversal of 81473187 is 78137418.

It is an interprime number because it is at equal distance from previous prime (81473173) and next prime (81473201).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81473187 - 2¹⁰ = 81472163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81475187) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67639 + ... + 68832.

It is an arithmetic number, because the mean of its divisors is an integer number (13647200).

Almost surely, 2^81473187 is an apocalyptic number.

81473187 is a deficient number, since it is larger than the sum of its proper divisors (27704413).

81473187 is a wasteful number, since it uses less digits than its factorization.

81473187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136673.

The product of its digits is 37632, while the sum is 39.

The square root of 81473187 is about 9026.2498857499. The cubic root of 81473187 is about 433.5157712414.

The spelling of 81473187 in words is "eighty-one million, four hundred seventy-three thousand, one hundred eighty-seven".