81030356 has 12 divisors (see below), whose sum is σ = 154694400. Its totient is φ = 36831960.

The previous prime is 81030353. The next prime is 81030359. The reversal of 81030356 is 65303018.

It is an interprime number because it is at equal distance from previous prime (81030353) and next prime (81030359).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81030353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 920756 + ... + 920843.

It is an arithmetic number, because the mean of its divisors is an integer number (12891200).

Almost surely, 2^81030356 is an apocalyptic number.

It is an amenable number.

81030356 is a deficient number, since it is larger than the sum of its proper divisors (73664044).

81030356 is a wasteful number, since it uses less digits than its factorization.

81030356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841614 (or 1841612 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 81030356 is about 9001.6862864688. The cubic root of 81030356 is about 432.7289148699.

The spelling of 81030356 in words is "eighty-one million, thirty thousand, three hundred fifty-six".