81161802 has 24 divisors (see below), whose sum is σ = 183497184. Its totient is φ = 25877544.

The previous prime is 81161797. The next prime is 81161803. The reversal of 81161802 is 20816118.

It is not an unprimeable number, because it can be changed into a prime (81161803) 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, 97608 + ... + 98435.

It is an arithmetic number, because the mean of its divisors is an integer number (7645716).

Almost surely, 2^81161802 is an apocalyptic number.

81161802 is an abundant number, since it is smaller than the sum of its proper divisors (102335382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81161802 is a wasteful number, since it uses less digits than its factorization.

81161802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196074 (or 196071 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 81161802 is about 9008.9845154712. The cubic root of 81161802 is about 432.9627768388.

The spelling of 81161802 in words is "eighty-one million, one hundred sixty-one thousand, eight hundred two".