81997202 has 16 divisors (see below), whose sum is σ = 140812800. Its totient is φ = 35080128.

The previous prime is 81997199. The next prime is 81997211. The reversal of 81997202 is 20279918.

It is a super-2 number, since 2×81997202² = 13447082271657608, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3674 + ... + 13322.

It is an arithmetic number, because the mean of its divisors is an integer number (8800800).

Almost surely, 2^81997202 is an apocalyptic number.

81997202 is a deficient number, since it is larger than the sum of its proper divisors (58815598).

81997202 is a wasteful number, since it uses less digits than its factorization.

81997202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10265.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 81997202 is about 9055.2306431145. The cubic root of 81997202 is about 434.4432071145.

The spelling of 81997202 in words is "eighty-one million, nine hundred ninety-seven thousand, two hundred two".