81000352 has 12 divisors (see below), whose sum is σ = 159469506. Its totient is φ = 40500160.

The previous prime is 81000343. The next prime is 81000371. The reversal of 81000352 is 25300018.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 75411856 + 5588496 = 8684^2 + 2364^2 .

It is a super-2 number, since 2×81000352² = 13122114048247808, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1265599 + ... + 1265662.

Almost surely, 2^81000352 is an apocalyptic number.

It is an amenable number.

81000352 is a deficient number, since it is larger than the sum of its proper divisors (78469154).

81000352 is a wasteful number, since it uses less digits than its factorization.

81000352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2531271 (or 2531263 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 81000352 is about 9000.0195555343. The cubic root of 81000352 is about 432.6754978467.

The spelling of 81000352 in words is "eighty-one million, three hundred fifty-two", and thus it is an aban number.