31872231 has 16 divisors (see below), whose sum is σ = 47416320. Its totient is φ = 21159000.

The previous prime is 31872223. The next prime is 31872241. The reversal of 31872231 is 13227813.

It is not a de Polignac number, because 31872231 - 2³ = 31872223 is a prime.

It is a super-2 number, since 2×31872231² = 2031678217834722, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 31872195 and 31872204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31872221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4426 + ... + 9128.

It is an arithmetic number, because the mean of its divisors is an integer number (2963520).

Almost surely, 2^31872231 is an apocalyptic number.

31872231 is a deficient number, since it is larger than the sum of its proper divisors (15544089).

31872231 is a wasteful number, since it uses less digits than its factorization.

31872231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4963 (or 4957 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 31872231 is about 5645.5496632303. The cubic root of 31872231 is about 317.0571037585.

The spelling of 31872231 in words is "thirty-one million, eight hundred seventy-two thousand, two hundred thirty-one".