81250473 has 16 divisors (see below), whose sum is σ = 113254400. Its totient is φ = 51751440.

The previous prime is 81250469. The next prime is 81250511. The reversal of 81250473 is 37405218.

It is not a de Polignac number, because 81250473 - 2² = 81250469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81250473.

It is not an unprimeable number, because it can be changed into a prime (81250073) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1818 + ... + 12876.

It is an arithmetic number, because the mean of its divisors is an integer number (7078400).

Almost surely, 2^81250473 is an apocalyptic number.

It is an amenable number.

81250473 is a deficient number, since it is larger than the sum of its proper divisors (32003927).

81250473 is a wasteful number, since it uses less digits than its factorization.

81250473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11172.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 81250473 is about 9013.9044259411. The cubic root of 81250473 is about 433.1203931429.

The spelling of 81250473 in words is "eighty-one million, two hundred fifty thousand, four hundred seventy-three".