31146229 has 2 divisors, whose sum is σ = 31146230. Its totient is φ = 31146228.

The previous prime is 31146221. The next prime is 31146239. The reversal of 31146229 is 92264113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30272004 + 874225 = 5502^2 + 935^2 .

It is an emirp because it is prime and its reverse (92264113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31146229 - 2³ = 31146221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31146197 and 31146206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31146221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15573114 + 15573115.

It is an arithmetic number, because the mean of its divisors is an integer number (15573115).

Almost surely, 2^31146229 is an apocalyptic number.

It is an amenable number.

31146229 is a deficient number, since it is larger than the sum of its proper divisors (1).

31146229 is an equidigital number, since it uses as much as digits as its factorization.

31146229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 28.

The square root of 31146229 is about 5580.8806652714. The cubic root of 31146229 is about 314.6312271315.

It can be divided in two parts, 31146 and 229, that added together give a triangular number (31375 = T₂₅₀).

The spelling of 31146229 in words is "thirty-one million, one hundred forty-six thousand, two hundred twenty-nine".