31400023 has 2 divisors, whose sum is σ = 31400024. Its totient is φ = 31400022.

The previous prime is 31400021. The next prime is 31400029. The reversal of 31400023 is 32000413.

It is a weak prime.

It is an emirp because it is prime and its reverse (32000413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31400023 - 2¹ = 31400021 is a prime.

It is a super-2 number, since 2×31400023² = 1971922888801058, which contains 22 as substring.

Together with 31400021, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 31399976 and 31400012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31400021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15700011 + 15700012.

It is an arithmetic number, because the mean of its divisors is an integer number (15700012).

Almost surely, 2^31400023 is an apocalyptic number.

31400023 is a deficient number, since it is larger than the sum of its proper divisors (1).

31400023 is an equidigital number, since it uses as much as digits as its factorization.

31400023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 31400023 is about 5603.5723427114. The cubic root of 31400023 is about 315.4835037165.

Adding to 31400023 its reverse (32000413), we get a palindrome (63400436).

The spelling of 31400023 in words is "thirty-one million, four hundred thousand, twenty-three".