31230261 has 6 divisors (see below), whose sum is σ = 45110390. Its totient is φ = 20820168.

The previous prime is 31230259. The next prime is 31230271. The reversal of 31230261 is 16203213.

It can be written as a sum of positive squares in only one way, i.e., 28998225 + 2232036 = 5385^2 + 1494^2 .

It is not a de Polignac number, because 31230261 - 2¹ = 31230259 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 (31230211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1735006 + ... + 1735023.

Almost surely, 2^31230261 is an apocalyptic number.

It is an amenable number.

31230261 is a deficient number, since it is larger than the sum of its proper divisors (13880129).

31230261 is a wasteful number, since it uses less digits than its factorization.

31230261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3470035 (or 3470032 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 31230261 is about 5588.4041550339. The cubic root of 31230261 is about 314.9139296211.

Adding to 31230261 its reverse (16203213), we get a palindrome (47433474).

The spelling of 31230261 in words is "thirty-one million, two hundred thirty thousand, two hundred sixty-one".