81450135 has 96 divisors (see below), whose sum is σ = 161336448. Its totient is φ = 37739520.

The previous prime is 81450119. The next prime is 81450139. The reversal of 81450135 is 53105418.

81450135 is a `hidden beast` number, since 81 + 450 + 135 = 666.

It is not a de Polignac number, because 81450135 - 2⁴ = 81450119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81450099 and 81450108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81450139) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1147150 + ... + 1147220.

It is an arithmetic number, because the mean of its divisors is an integer number (1680588).

Almost surely, 2^81450135 is an apocalyptic number.

81450135 is a deficient number, since it is larger than the sum of its proper divisors (79886313).

81450135 is a wasteful number, since it uses less digits than its factorization.

81450135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185 (or 182 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 81450135 is about 9024.9728531448. The cubic root of 81450135 is about 433.4748811090.

The spelling of 81450135 in words is "eighty-one million, four hundred fifty thousand, one hundred thirty-five".