81040202 has 8 divisors (see below), whose sum is σ = 122813796. Its totient is φ = 40102272.

The previous prime is 81040189. The next prime is 81040213. The reversal of 81040202 is 20204018.

It can be written as a sum of positive squares in 2 ways, for example, as 81018001 + 22201 = 9001^2 + 149^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208673 + ... + 209060.

Almost surely, 2^81040202 is an apocalyptic number.

81040202 is a deficient number, since it is larger than the sum of its proper divisors (41773594).

81040202 is a wasteful number, since it uses less digits than its factorization.

81040202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417832.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 81040202 is about 9002.2331673869. The cubic root of 81040202 is about 432.7464411261.

The spelling of 81040202 in words is "eighty-one million, forty thousand, two hundred two".