81030355 has 16 divisors (see below), whose sum is σ = 111550464. Its totient is φ = 55352160.

The previous prime is 81030353. The next prime is 81030359. The reversal of 81030355 is 55303018.

It is a happy number.

It is not a de Polignac number, because 81030355 - 2¹ = 81030353 is a prime.

It is a Duffinian number.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5214 + ... + 13756.

It is an arithmetic number, because the mean of its divisors is an integer number (6971904).

Almost surely, 2^81030355 is an apocalyptic number.

81030355 is a deficient number, since it is larger than the sum of its proper divisors (30520109).

81030355 is a wasteful number, since it uses less digits than its factorization.

81030355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8826.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 81030355 is about 9001.6862309236. The cubic root of 81030355 is about 432.7289130898.

The spelling of 81030355 in words is "eighty-one million, thirty thousand, three hundred fifty-five".