81130623 has 12 divisors (see below), whose sum is σ = 125835480. Its totient is φ = 46360272.

The previous prime is 81130619. The next prime is 81130633. The reversal of 81130623 is 32603118.

It is not a de Polignac number, because 81130623 - 2² = 81130619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81130593 and 81130602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81130633) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 275808 + ... + 276101.

It is an arithmetic number, because the mean of its divisors is an integer number (10486290).

Almost surely, 2^81130623 is an apocalyptic number.

81130623 is a deficient number, since it is larger than the sum of its proper divisors (44704857).

81130623 is a wasteful number, since it uses less digits than its factorization.

81130623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551926 (or 551919 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 81130623 is about 9007.2539100438. The cubic root of 81130623 is about 432.9073276206.

The spelling of 81130623 in words is "eighty-one million, one hundred thirty thousand, six hundred twenty-three".