31420379 has 2 divisors, whose sum is σ = 31420380. Its totient is φ = 31420378.

The previous prime is 31420343. The next prime is 31420381. The reversal of 31420379 is 97302413.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31420379 - 2²⁴ = 14643163 is a prime.

Together with 31420381, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31420579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15710189 + 15710190.

It is an arithmetic number, because the mean of its divisors is an integer number (15710190).

Almost surely, 2^31420379 is an apocalyptic number.

31420379 is a deficient number, since it is larger than the sum of its proper divisors (1).

31420379 is an equidigital number, since it uses as much as digits as its factorization.

31420379 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 31420379 is about 5605.3883897550. The cubic root of 31420379 is about 315.5516628486.

The spelling of 31420379 in words is "thirty-one million, four hundred twenty thousand, three hundred seventy-nine".