81030571 has 8 divisors (see below), whose sum is σ = 81768960. Its totient is φ = 80295528.

The previous prime is 81030557. The next prime is 81030577. The reversal of 81030571 is 17503018.

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

It is a cyclic number.

It is not a de Polignac number, because 81030571 - 2²³ = 72641963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81030577) 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, 77470 + ... + 78508.

It is an arithmetic number, because the mean of its divisors is an integer number (10221120).

Almost surely, 2^81030571 is an apocalyptic number.

81030571 is a deficient number, since it is larger than the sum of its proper divisors (738389).

81030571 is a wasteful number, since it uses less digits than its factorization.

81030571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1673.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 81030571 is about 9001.6982286677. The cubic root of 81030571 is about 432.7292975933.

Adding to 81030571 its reverse (17503018), we get a palindrome (98533589).

The spelling of 81030571 in words is "eighty-one million, thirty thousand, five hundred seventy-one".