31887253 has 2 divisors, whose sum is σ = 31887254. Its totient is φ = 31887252.

The previous prime is 31887241. The next prime is 31887281. The reversal of 31887253 is 35278813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28708164 + 3179089 = 5358^2 + 1783^2 .

It is an emirp because it is prime and its reverse (35278813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31887253 - 2⁹ = 31886741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31887353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15943626 + 15943627.

It is an arithmetic number, because the mean of its divisors is an integer number (15943627).

Almost surely, 2^31887253 is an apocalyptic number.

It is an amenable number.

31887253 is a deficient number, since it is larger than the sum of its proper divisors (1).

31887253 is an equidigital number, since it uses as much as digits as its factorization.

31887253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 37.

The square root of 31887253 is about 5646.8799349729. The cubic root of 31887253 is about 317.1069076535.

It can be divided in two parts, 318 and 87253, that added together give a triangular number (87571 = T₄₁₈).

The spelling of 31887253 in words is "thirty-one million, eight hundred eighty-seven thousand, two hundred fifty-three".