81371427 has 8 divisors (see below), whose sum is σ = 108546816. Its totient is φ = 54221832.

The previous prime is 81371371. The next prime is 81371453. The reversal of 81371427 is 72417318.

It is a happy number.

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

It is not a de Polignac number, because 81371427 - 2¹⁰ = 81370403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81371327) 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, 2818 + ... + 13064.

It is an arithmetic number, because the mean of its divisors is an integer number (13568352).

Almost surely, 2^81371427 is an apocalyptic number.

81371427 is a deficient number, since it is larger than the sum of its proper divisors (27175389).

81371427 is a wasteful number, since it uses less digits than its factorization.

81371427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12897.

The product of its digits is 9408, while the sum is 33.

The square root of 81371427 is about 9020.6112320618. The cubic root of 81371427 is about 433.3352089991.

The spelling of 81371427 in words is "eighty-one million, three hundred seventy-one thousand, four hundred twenty-seven".