31020223 has 8 divisors (see below), whose sum is σ = 35371728. Its totient is φ = 26949504.

The previous prime is 31020221. The next prime is 31020233. The reversal of 31020223 is 32202013.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 31020223 - 2¹ = 31020221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31020221) 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, 69961 + ... + 70402.

It is an arithmetic number, because the mean of its divisors is an integer number (4421466).

Almost surely, 2^31020223 is an apocalyptic number.

31020223 is a deficient number, since it is larger than the sum of its proper divisors (4351505).

31020223 is a wasteful number, since it uses less digits than its factorization.

31020223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140393.

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

The square root of 31020223 is about 5569.5801457561. The cubic root of 31020223 is about 314.2063602194.

Adding to 31020223 its reverse (32202013), we get a palindrome (63222236).

The spelling of 31020223 in words is "thirty-one million, twenty thousand, two hundred twenty-three".