81272493 has 24 divisors (see below), whose sum is σ = 119845440. Its totient is φ = 53061120.

The previous prime is 81272491. The next prime is 81272533. The reversal of 81272493 is 39427218.

It is not a de Polignac number, because 81272493 - 2¹ = 81272491 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81272491) 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, 122998 + ... + 123656.

It is an arithmetic number, because the mean of its divisors is an integer number (4993560).

Almost surely, 2^81272493 is an apocalyptic number.

It is an amenable number.

81272493 is a deficient number, since it is larger than the sum of its proper divisors (38572947).

81272493 is a wasteful number, since it uses less digits than its factorization.

81272493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929 (or 926 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 81272493 is about 9015.1257894718. The cubic root of 81272493 is about 433.1595168109.

The spelling of 81272493 in words is "eighty-one million, two hundred seventy-two thousand, four hundred ninety-three".