81030427 has 4 divisors (see below), whose sum is σ = 81070416. Its totient is φ = 80990440.

The previous prime is 81030419. The next prime is 81030457. The reversal of 81030427 is 72403018.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72403018 = 2 ⋅36201509.

It is a cyclic number.

It is not a de Polignac number, because 81030427 - 2³ = 81030419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81030457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16783 + ... + 21064.

It is an arithmetic number, because the mean of its divisors is an integer number (20267604).

Almost surely, 2^81030427 is an apocalyptic number.

81030427 is a deficient number, since it is larger than the sum of its proper divisors (39989).

81030427 is a wasteful number, since it uses less digits than its factorization.

81030427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39988.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 81030427 is about 9001.6902301734. The cubic root of 81030427 is about 432.7290412577.

The spelling of 81030427 in words is "eighty-one million, thirty thousand, four hundred twenty-seven".