81162633 has 4 divisors (see below), whose sum is σ = 108216848. Its totient is φ = 54108420.

The previous prime is 81162611. The next prime is 81162637. The reversal of 81162633 is 33626118.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 81162633 - 2⁶ = 81162569 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81162633.

It is not an unprimeable number, because it can be changed into a prime (81162637) 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, 13527103 + ... + 13527108.

It is an arithmetic number, because the mean of its divisors is an integer number (27054212).

Almost surely, 2^81162633 is an apocalyptic number.

It is an amenable number.

81162633 is a deficient number, since it is larger than the sum of its proper divisors (27054215).

81162633 is a wasteful number, since it uses less digits than its factorization.

81162633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27054214.

The product of its digits is 5184, while the sum is 30.

The square root of 81162633 is about 9009.0306359785. The cubic root of 81162633 is about 432.9642545078.

The spelling of 81162633 in words is "eighty-one million, one hundred sixty-two thousand, six hundred thirty-three".