81433011 has 32 divisors (see below), whose sum is σ = 122492160. Its totient is φ = 47692800.

The previous prime is 81432991. The next prime is 81433019. The reversal of 81433011 is 11033418.

It is not a de Polignac number, because 81433011 - 2⁵ = 81432979 is a prime.

It is a super-2 number, since 2×81433011² = 13262670561052242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81433019) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 187851 + ... + 188283.

It is an arithmetic number, because the mean of its divisors is an integer number (3827880).

Almost surely, 2^81433011 is an apocalyptic number.

81433011 is a deficient number, since it is larger than the sum of its proper divisors (41059149).

81433011 is a wasteful number, since it uses less digits than its factorization.

81433011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 81433011 is about 9024.0241023614. The cubic root of 81433011 is about 433.4445011957. Note that the first 3 decimals are identical.

Adding to 81433011 its reverse (11033418), we get a palindrome (92466429).

The spelling of 81433011 in words is "eighty-one million, four hundred thirty-three thousand, eleven".