81352107 has 20 divisors (see below), whose sum is σ = 122429736. Its totient is φ = 53831520.

The previous prime is 81352043. The next prime is 81352109. The reversal of 81352107 is 70125318.

It is not a de Polignac number, because 81352107 - 2⁶ = 81352043 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (81352109) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7432 + ... + 14762.

Almost surely, 2^81352107 is an apocalyptic number.

81352107 is a deficient number, since it is larger than the sum of its proper divisors (41077629).

81352107 is a wasteful number, since it uses less digits than its factorization.

81352107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7480 (or 7471 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 81352107 is about 9019.5402876200. The cubic root of 81352107 is about 433.3009107234.

The spelling of 81352107 in words is "eighty-one million, three hundred fifty-two thousand, one hundred seven".