31220623 has 8 divisors (see below), whose sum is σ = 36510848. Its totient is φ = 26137944.

The previous prime is 31220621. The next prime is 31220633. The reversal of 31220623 is 32602213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31220623 - 2¹ = 31220621 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31220623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51561 + ... + 52162.

It is an arithmetic number, because the mean of its divisors is an integer number (4563856).

Almost surely, 2^31220623 is an apocalyptic number.

31220623 is a deficient number, since it is larger than the sum of its proper divisors (5290225).

31220623 is a wasteful number, since it uses less digits than its factorization.

31220623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103773.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 31220623 is about 5587.5417671817. The cubic root of 31220623 is about 314.8815309941.

Adding to 31220623 its reverse (32602213), we get a palindrome (63822836).

The spelling of 31220623 in words is "thirty-one million, two hundred twenty thousand, six hundred twenty-three".