31378423 has 2 divisors, whose sum is σ = 31378424. Its totient is φ = 31378422.

The previous prime is 31378421. The next prime is 31378453. The reversal of 31378423 is 32487313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31378423 - 2¹ = 31378421 is a prime.

Together with 31378421, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31378421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15689211 + 15689212.

It is an arithmetic number, because the mean of its divisors is an integer number (15689212).

Almost surely, 2^31378423 is an apocalyptic number.

31378423 is a deficient number, since it is larger than the sum of its proper divisors (1).

31378423 is an equidigital number, since it uses as much as digits as its factorization.

31378423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 31.

The square root of 31378423 is about 5601.6446692021. The cubic root of 31378423 is about 315.4111470091.

The spelling of 31378423 in words is "thirty-one million, three hundred seventy-eight thousand, four hundred twenty-three".