82981145 has 16 divisors (see below), whose sum is σ = 107427600. Its totient is φ = 61169664.

The previous prime is 82981139. The next prime is 82981153. The reversal of 82981145 is 54118928.

It can be written as a sum of positive squares in 8 ways, for example, as 1042441 + 81938704 = 1021^2 + 9052^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82981145 is a prime.

It is a super-2 number, since 2×82981145² = 13771740851022050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 82981099 and 82981108.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67577 + ... + 68793.

It is an arithmetic number, because the mean of its divisors is an integer number (6714225).

Almost surely, 2^82981145 is an apocalyptic number.

It is an amenable number.

82981145 is a deficient number, since it is larger than the sum of its proper divisors (24446455).

82981145 is a wasteful number, since it uses less digits than its factorization.

82981145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2284.

The product of its digits is 23040, while the sum is 38.

The square root of 82981145 is about 9109.3987178079. The cubic root of 82981145 is about 436.1740337835.

The spelling of 82981145 in words is "eighty-two million, nine hundred eighty-one thousand, one hundred forty-five".