81350109 has 32 divisors (see below), whose sum is σ = 126403200. Its totient is φ = 51649920.

The previous prime is 81350099. The next prime is 81350119. The reversal of 81350109 is 90105318.

It is an interprime number because it is at equal distance from previous prime (81350099) and next prime (81350119).

It is not a de Polignac number, because 81350109 - 2¹³ = 81341917 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81350119) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46747 + ... + 48455.

It is an arithmetic number, because the mean of its divisors is an integer number (3950100).

Almost surely, 2^81350109 is an apocalyptic number.

It is an amenable number.

81350109 is a deficient number, since it is larger than the sum of its proper divisors (45053091).

81350109 is a wasteful number, since it uses less digits than its factorization.

81350109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1802 (or 1796 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 81350109 is about 9019.4295274147. The cubic root of 81350109 is about 433.2973634180.

The spelling of 81350109 in words is "eighty-one million, three hundred fifty thousand, one hundred nine".