81297202 has 16 divisors (see below), whose sum is σ = 139484160. Its totient is φ = 34812288.

The previous prime is 81297199. The next prime is 81297211. The reversal of 81297202 is 20279218.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26799 + ... + 29677.

It is an arithmetic number, because the mean of its divisors is an integer number (8717760).

Almost surely, 2^81297202 is an apocalyptic number.

81297202 is a deficient number, since it is larger than the sum of its proper divisors (58186958).

81297202 is a wasteful number, since it uses less digits than its factorization.

81297202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4905.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 81297202 is about 9016.4961043634. The cubic root of 81297202 is about 433.2034097019.

The spelling of 81297202 in words is "eighty-one million, two hundred ninety-seven thousand, two hundred two".