81418102 has 4 divisors (see below), whose sum is σ = 122127156. Its totient is φ = 40709050.

The previous prime is 81418081. The next prime is 81418133. The reversal of 81418102 is 20181418.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20181418 = 2 ⋅10090709.

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, 20354524 + ... + 20354527.

It is an arithmetic number, because the mean of its divisors is an integer number (30531789).

Almost surely, 2^81418102 is an apocalyptic number.

81418102 is a deficient number, since it is larger than the sum of its proper divisors (40709054).

81418102 is a wasteful number, since it uses less digits than its factorization.

81418102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40709053.

The product of its (nonzero) digits is 512, while the sum is 25.

The square root of 81418102 is about 9023.1979918430. The cubic root of 81418102 is about 433.4180474746.

The spelling of 81418102 in words is "eighty-one million, four hundred eighteen thousand, one hundred two".