31426229 has 2 divisors, whose sum is σ = 31426230. Its totient is φ = 31426228.

The previous prime is 31426223. The next prime is 31426231. The reversal of 31426229 is 92262413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16200625 + 15225604 = 4025^2 + 3902^2 .

It is an emirp because it is prime and its reverse (92262413) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31426229 is a prime.

Together with 31426231, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1940618 and since 31426229 and 1940618 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31426223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15713114 + 15713115.

It is an arithmetic number, because the mean of its divisors is an integer number (15713115).

Almost surely, 2^31426229 is an apocalyptic number.

It is an amenable number.

31426229 is a deficient number, since it is larger than the sum of its proper divisors (1).

31426229 is an equidigital number, since it uses as much as digits as its factorization.

31426229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 29.

The square root of 31426229 is about 5605.9101847960. The cubic root of 31426229 is about 315.5712452846.

The spelling of 31426229 in words is "thirty-one million, four hundred twenty-six thousand, two hundred twenty-nine".