31421623 has 2 divisors, whose sum is σ = 31421624. Its totient is φ = 31421622.

The previous prime is 31421617. The next prime is 31421641. The reversal of 31421623 is 32612413.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31421623 - 2⁹ = 31421111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31421594 and 31421603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31421653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15710811 + 15710812.

It is an arithmetic number, because the mean of its divisors is an integer number (15710812).

Almost surely, 2^31421623 is an apocalyptic number.

31421623 is a deficient number, since it is larger than the sum of its proper divisors (1).

31421623 is an equidigital number, since it uses as much as digits as its factorization.

31421623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 22.

The square root of 31421623 is about 5605.4993533137. The cubic root of 31421623 is about 315.5558272487. Note that the first 3 decimals are identical.

The spelling of 31421623 in words is "thirty-one million, four hundred twenty-one thousand, six hundred twenty-three".