81025433 has 4 divisors (see below), whose sum is σ = 81052260. Its totient is φ = 80998608.

The previous prime is 81025409. The next prime is 81025457. The reversal of 81025433 is 33452018.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (81025409) and next prime (81025457).

It can be written as a sum of positive squares in 2 ways, for example, as 29300569 + 51724864 = 5413^2 + 7192^2 .

It is a cyclic number.

It is not a de Polignac number, because 81025433 - 2⁶ = 81025369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81025403) 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, 8210 + ... + 15147.

It is an arithmetic number, because the mean of its divisors is an integer number (20263065).

Almost surely, 2^81025433 is an apocalyptic number.

It is an amenable number.

81025433 is a deficient number, since it is larger than the sum of its proper divisors (26827).

81025433 is a wasteful number, since it uses less digits than its factorization.

81025433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26826.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 81025433 is about 9001.4128335501. The cubic root of 81025433 is about 432.7201512094.

The spelling of 81025433 in words is "eighty-one million, twenty-five thousand, four hundred thirty-three".