220312031 has 2 divisors, whose sum is σ = 220312032. Its totient is φ = 220312030.

The previous prime is 220312019. The next prime is 220312033. The reversal of 220312031 is 130213022.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220312031 is a prime.

It is a super-2 number, since 2×220312031² = 97074782006689922, which contains 22 as substring.

Together with 220312033, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 220311997 and 220312015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220312033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110156015 + 110156016.

It is an arithmetic number, because the mean of its divisors is an integer number (110156016).

Almost surely, 2^220312031 is an apocalyptic number.

220312031 is a deficient number, since it is larger than the sum of its proper divisors (1).

220312031 is an equidigital number, since it uses as much as digits as its factorization.

220312031 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 14.

The square root of 220312031 is about 14842.9118100189. The cubic root of 220312031 is about 603.9663437162.

Adding to 220312031 its reverse (130213022), we get a palindrome (350525053).

Subtracting from 220312031 its reverse (130213022), we obtain a palindrome (90099009).

The spelling of 220312031 in words is "two hundred twenty million, three hundred twelve thousand, thirty-one".