31748531 has 2 divisors, whose sum is σ = 31748532. Its totient is φ = 31748530.

The previous prime is 31748513. The next prime is 31748543. The reversal of 31748531 is 13584713.

Together with previous prime (31748513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31748531 - 2¹⁸ = 31486387 is a prime.

It is a super-2 number, since 2×31748531² = 2015938441315922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31748581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15874265 + 15874266.

It is an arithmetic number, because the mean of its divisors is an integer number (15874266).

Almost surely, 2^31748531 is an apocalyptic number.

31748531 is a deficient number, since it is larger than the sum of its proper divisors (1).

31748531 is an equidigital number, since it uses as much as digits as its factorization.

31748531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 32.

The square root of 31748531 is about 5634.5834806133. The cubic root of 31748531 is about 316.6463929157.

The spelling of 31748531 in words is "thirty-one million, seven hundred forty-eight thousand, five hundred thirty-one".