81135038 has 4 divisors (see below), whose sum is σ = 121702560. Its totient is φ = 40567518.

The previous prime is 81135031. The next prime is 81135049. The reversal of 81135038 is 83053118.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83053118 = 2 ⋅41526559.

It is a super-2 number, since 2×81135038² = 13165788782522888, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81135038.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81135031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20283758 + ... + 20283761.

It is an arithmetic number, because the mean of its divisors is an integer number (30425640).

Almost surely, 2^81135038 is an apocalyptic number.

81135038 is a deficient number, since it is larger than the sum of its proper divisors (40567522).

81135038 is a wasteful number, since it uses less digits than its factorization.

81135038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40567521.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 81135038 is about 9007.4989869553. The cubic root of 81135038 is about 432.9151801885.

The spelling of 81135038 in words is "eighty-one million, one hundred thirty-five thousand, thirty-eight".