31402123 has 2 divisors, whose sum is σ = 31402124. Its totient is φ = 31402122.

The previous prime is 31402121. The next prime is 31402139. The reversal of 31402123 is 32120413.

It is a happy number.

It is an a-pointer prime, because the next prime (31402139) can be obtained adding 31402123 to its sum of digits (16).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31402123 - 2¹ = 31402121 is a prime.

Together with 31402121, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 31402097 and 31402106.

It is not a weakly prime, because it can be changed into another prime (31402121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15701061 + 15701062.

It is an arithmetic number, because the mean of its divisors is an integer number (15701062).

Almost surely, 2^31402123 is an apocalyptic number.

31402123 is a deficient number, since it is larger than the sum of its proper divisors (1).

31402123 is an equidigital number, since it uses as much as digits as its factorization.

31402123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 31402123 is about 5603.7597200451. The cubic root of 31402123 is about 315.4905366263.

Adding to 31402123 its reverse (32120413), we get a palindrome (63522536).

The spelling of 31402123 in words is "thirty-one million, four hundred two thousand, one hundred twenty-three".