31472261 has 2 divisors, whose sum is σ = 31472262. Its totient is φ = 31472260.

The previous prime is 31472239. The next prime is 31472291. The reversal of 31472261 is 16227413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30184036 + 1288225 = 5494^2 + 1135^2 .

It is a cyclic number.

It is not a de Polignac number, because 31472261 - 2¹⁴ = 31455877 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31472261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31472201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15736130 + 15736131.

It is an arithmetic number, because the mean of its divisors is an integer number (15736131).

Almost surely, 2^31472261 is an apocalyptic number.

It is an amenable number.

31472261 is a deficient number, since it is larger than the sum of its proper divisors (1).

31472261 is an equidigital number, since it uses as much as digits as its factorization.

31472261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 26.

The square root of 31472261 is about 5610.0143493578. The cubic root of 31472261 is about 315.7252492193.

Adding to 31472261 its reverse (16227413), we get a palindrome (47699674).

The spelling of 31472261 in words is "thirty-one million, four hundred seventy-two thousand, two hundred sixty-one".