31321427 has 2 divisors, whose sum is σ = 31321428. Its totient is φ = 31321426.

The previous prime is 31321399. The next prime is 31321441. The reversal of 31321427 is 72412313.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31321427 - 2¹⁸ = 31059283 is a prime.

It is not a weakly prime, because it can be changed into another prime (31321447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660713 + 15660714.

It is an arithmetic number, because the mean of its divisors is an integer number (15660714).

Almost surely, 2^31321427 is an apocalyptic number.

31321427 is a deficient number, since it is larger than the sum of its proper divisors (1).

31321427 is an equidigital number, since it uses as much as digits as its factorization.

31321427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 23.

The square root of 31321427 is about 5596.5549224501. The cubic root of 31321427 is about 315.2200595501.

The spelling of 31321427 in words is "thirty-one million, three hundred twenty-one thousand, four hundred twenty-seven".