209232031 has 4 divisors (see below), whose sum is σ = 210223864. Its totient is φ = 208240200.

The previous prime is 209232011. The next prime is 209232083. The reversal of 209232031 is 130232902.

209232031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130232902 = 2 ⋅65116451.

It is a cyclic number.

It is not a de Polignac number, because 209232031 - 2⁵ = 209231999 is a prime.

It is a super-2 number, since 2×209232031² = 87556085592769922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 209231993 and 209232011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209232011) 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, 495600 + ... + 496021.

It is an arithmetic number, because the mean of its divisors is an integer number (52555966).

Almost surely, 2^209232031 is an apocalyptic number.

209232031 is a deficient number, since it is larger than the sum of its proper divisors (991833).

209232031 is an equidigital number, since it uses as much as digits as its factorization.

209232031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991832.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 209232031 is about 14464.8550286548. The cubic root of 209232031 is about 593.6667470936. Note that the first 3 decimals are identical.

Adding to 209232031 its reverse (130232902), we get a palindrome (339464933).

The spelling of 209232031 in words is "two hundred nine million, two hundred thirty-two thousand, thirty-one".