81196142 has 4 divisors (see below), whose sum is σ = 121794216. Its totient is φ = 40598070.

The previous prime is 81196117. The next prime is 81196151. The reversal of 81196142 is 24169118.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 81196099 and 81196108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20299034 + ... + 20299037.

It is an arithmetic number, because the mean of its divisors is an integer number (30448554).

Almost surely, 2^81196142 is an apocalyptic number.

81196142 is a deficient number, since it is larger than the sum of its proper divisors (40598074).

81196142 is a wasteful number, since it uses less digits than its factorization.

81196142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40598073.

The product of its digits is 3456, while the sum is 32.

The square root of 81196142 is about 9010.8901890990. The cubic root of 81196142 is about 433.0238311977.

The spelling of 81196142 in words is "eighty-one million, one hundred ninety-six thousand, one hundred forty-two".