81507433 has 8 divisors (see below), whose sum is σ = 95052800. Its totient is φ = 69863220.

The previous prime is 81507427. The next prime is 81507449. The reversal of 81507433 is 33470518.

It is not a de Polignac number, because 81507433 - 2⁹ = 81506921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81507395 and 81507404.

It is not an unprimeable number, because it can be changed into a prime (81502433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118473 + ... + 119158.

It is an arithmetic number, because the mean of its divisors is an integer number (11881600).

Almost surely, 2^81507433 is an apocalyptic number.

It is an amenable number.

81507433 is a deficient number, since it is larger than the sum of its proper divisors (13545367).

81507433 is an equidigital number, since it uses as much as digits as its factorization.

81507433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237652 (or 237638 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 81507433 is about 9028.1467090428. The cubic root of 81507433 is about 433.5765032933.

The spelling of 81507433 in words is "eighty-one million, five hundred seven thousand, four hundred thirty-three".