103031209 has 4 divisors (see below), whose sum is σ = 104031616. Its totient is φ = 102030804.

The previous prime is 103031189. The next prime is 103031231. The reversal of 103031209 is 902130301.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 103031209 - 2⁵ = 103031177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (103031239) 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, 500049 + ... + 500254.

It is an arithmetic number, because the mean of its divisors is an integer number (26007904).

Almost surely, 2^103031209 is an apocalyptic number.

It is an amenable number.

103031209 is a deficient number, since it is larger than the sum of its proper divisors (1000407).

103031209 is a wasteful number, since it uses less digits than its factorization.

103031209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000406.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 103031209 is about 10150.4290057120. The cubic root of 103031209 is about 468.8021542207.

The spelling of 103031209 in words is "one hundred three million, thirty-one thousand, two hundred nine".