81130430 has 16 divisors (see below), whose sum is σ = 152384544. Its totient is φ = 31041120.

The previous prime is 81130411. The next prime is 81130433. The reversal of 81130430 is 3403118.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81130433) 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, 176141 + ... + 176600.

It is an arithmetic number, because the mean of its divisors is an integer number (9524034).

Almost surely, 2^81130430 is an apocalyptic number.

81130430 is a deficient number, since it is larger than the sum of its proper divisors (71254114).

81130430 is a wasteful number, since it uses less digits than its factorization.

81130430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352771.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 81130430 is about 9007.2431964503. The cubic root of 81130430 is about 432.9069843421.

Adding to 81130430 its reverse (3403118), we get a palindrome (84533548).

The spelling of 81130430 in words is "eighty-one million, one hundred thirty thousand, four hundred thirty".