31226413 has 2 divisors, whose sum is σ = 31226414. Its totient is φ = 31226412.

The previous prime is 31226411. The next prime is 31226431. The reversal of 31226413 is 31462213.

Together with next prime (31226431) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16990884 + 14235529 = 4122^2 + 3773^2 .

It is a cyclic number.

It is not a de Polignac number, because 31226413 - 2¹ = 31226411 is a prime.

Together with 31226411, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31226411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15613206 + 15613207.

It is an arithmetic number, because the mean of its divisors is an integer number (15613207).

Almost surely, 2^31226413 is an apocalyptic number.

It is an amenable number.

31226413 is a deficient number, since it is larger than the sum of its proper divisors (1).

31226413 is an equidigital number, since it uses as much as digits as its factorization.

31226413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 22.

The square root of 31226413 is about 5588.0598600946. The cubic root of 31226413 is about 314.9009951730.

Adding to 31226413 its reverse (31462213), we get a palindrome (62688626).

The spelling of 31226413 in words is "thirty-one million, two hundred twenty-six thousand, four hundred thirteen".