40220231 has 2 divisors, whose sum is σ = 40220232. Its totient is φ = 40220230.

The previous prime is 40220197. The next prime is 40220233. The reversal of 40220231 is 13202204.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40220231 is a prime.

It is a super-2 number, since 2×40220231² = 3235333963386722, which contains 22 as substring.

Together with 40220233, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40220233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20110115 + 20110116.

It is an arithmetic number, because the mean of its divisors is an integer number (20110116).

Almost surely, 2^40220231 is an apocalyptic number.

40220231 is a deficient number, since it is larger than the sum of its proper divisors (1).

40220231 is an equidigital number, since it uses as much as digits as its factorization.

40220231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 40220231 is about 6341.9422103958. The cubic root of 40220231 is about 342.6216904680.

Adding to 40220231 its reverse (13202204), we get a palindrome (53422435).

The spelling of 40220231 in words is "forty million, two hundred twenty thousand, two hundred thirty-one".