31126129 has 2 divisors, whose sum is σ = 31126130. Its totient is φ = 31126128.

The previous prime is 31126097. The next prime is 31126141. The reversal of 31126129 is 92162113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26286129 + 4840000 = 5127^2 + 2200^2 .

It is a cyclic number.

It is not a de Polignac number, because 31126129 - 2⁵ = 31126097 is a prime.

It is not a weakly prime, because it can be changed into another prime (31126169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15563064 + 15563065.

It is an arithmetic number, because the mean of its divisors is an integer number (15563065).

Almost surely, 2^31126129 is an apocalyptic number.

It is an amenable number.

31126129 is a deficient number, since it is larger than the sum of its proper divisors (1).

31126129 is an equidigital number, since it uses as much as digits as its factorization.

31126129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 25.

The square root of 31126129 is about 5579.0795835872. The cubic root of 31126129 is about 314.5635308832.

The spelling of 31126129 in words is "thirty-one million, one hundred twenty-six thousand, one hundred twenty-nine".