81022075 has 12 divisors (see below), whose sum is σ = 100639888. Its totient is φ = 64706400.

The previous prime is 81022057. The next prime is 81022079. The reversal of 81022075 is 57022018.

It is not a de Polignac number, because 81022075 - 2¹³ = 81013883 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81022079) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14074 + ... + 18976.

Almost surely, 2^81022075 is an apocalyptic number.

81022075 is a deficient number, since it is larger than the sum of its proper divisors (19617813).

81022075 is a wasteful number, since it uses less digits than its factorization.

81022075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5574 (or 5569 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 81022075 is about 9001.2263053431. The cubic root of 81022075 is about 432.7141732743.

The spelling of 81022075 in words is "eighty-one million, twenty-two thousand, seventy-five".