81196802 has 4 divisors (see below), whose sum is σ = 121795206. Its totient is φ = 40598400.

The previous prime is 81196799. The next prime is 81196847. The reversal of 81196802 is 20869118.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20869118 = 2 ⋅10434559.

It can be written as a sum of positive squares in only one way, i.e., 76405081 + 4791721 = 8741^2 + 2189^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20299199 + ... + 20299202.

Almost surely, 2^81196802 is an apocalyptic number.

81196802 is a deficient number, since it is larger than the sum of its proper divisors (40598404).

81196802 is a wasteful number, since it uses less digits than its factorization.

81196802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40598403.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 81196802 is about 9010.9268113774. The cubic root of 81196802 is about 433.0250044675.

The spelling of 81196802 in words is "eighty-one million, one hundred ninety-six thousand, eight hundred two".