81271450 has 48 divisors (see below), whose sum is σ = 164598840. Its totient is φ = 29675520.

The previous prime is 81271447. The next prime is 81271457. The reversal of 81271450 is 5417218.

It can be written as a sum of positive squares in 12 ways, for example, as 3143529 + 78127921 = 1773^2 + 8839^2 .

It is not an unprimeable number, because it can be changed into a prime (81271457) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62406 + ... + 63694.

Almost surely, 2^81271450 is an apocalyptic number.

81271450 is an abundant number, since it is smaller than the sum of its proper divisors (83327390).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81271450 is a wasteful number, since it uses less digits than its factorization.

81271450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1411 (or 1406 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 81271450 is about 9015.0679420623. The cubic root of 81271450 is about 433.1576638375.

Adding to 81271450 its reverse (5417218), we get a palindrome (86688668).

The spelling of 81271450 in words is "eighty-one million, two hundred seventy-one thousand, four hundred fifty".