31225429 has 2 divisors, whose sum is σ = 31225430. Its totient is φ = 31225428.

The previous prime is 31225399. The next prime is 31225457. The reversal of 31225429 is 92452213.

It is an a-pointer prime, because the next prime (31225457) can be obtained adding 31225429 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31102929 + 122500 = 5577^2 + 350^2 .

It is a cyclic number.

It is not a de Polignac number, because 31225429 - 2²¹ = 29128277 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31225397 and 31225406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31225459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15612714 + 15612715.

It is an arithmetic number, because the mean of its divisors is an integer number (15612715).

Almost surely, 2^31225429 is an apocalyptic number.

It is an amenable number.

31225429 is a deficient number, since it is larger than the sum of its proper divisors (1).

31225429 is an equidigital number, since it uses as much as digits as its factorization.

31225429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 28.

The square root of 31225429 is about 5587.9718145316. The cubic root of 31225429 is about 314.8976874408.

The spelling of 31225429 in words is "thirty-one million, two hundred twenty-five thousand, four hundred twenty-nine".