73431109 has 4 divisors (see below), whose sum is σ = 77750604. Its totient is φ = 69111616.

The previous prime is 73431101. The next prime is 73431119. The reversal of 73431109 is 90113437.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90113437 = 193 ⋅466909.

It can be written as a sum of positive squares in 2 ways, for example, as 48650625 + 24780484 = 6975^2 + 4978^2 .

It is a cyclic number.

It is not a de Polignac number, because 73431109 - 2³ = 73431101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73431101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2159722 + ... + 2159755.

It is an arithmetic number, because the mean of its divisors is an integer number (19437651).

Almost surely, 2^73431109 is an apocalyptic number.

It is an amenable number.

73431109 is a deficient number, since it is larger than the sum of its proper divisors (4319495).

73431109 is a wasteful number, since it uses less digits than its factorization.

73431109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4319494.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 73431109 is about 8569.1953531239. The cubic root of 73431109 is about 418.7550226174.

The spelling of 73431109 in words is "seventy-three million, four hundred thirty-one thousand, one hundred nine".