31125119 has 2 divisors, whose sum is σ = 31125120. Its totient is φ = 31125118.

The previous prime is 31125071. The next prime is 31125121. The reversal of 31125119 is 91152113.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31125119 is a prime.

It is a super-2 number, since 2×31125119² = 1937546065528322, which contains 22 as substring.

Together with 31125121, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 31125094 and 31125103.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31125719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15562559 + 15562560.

It is an arithmetic number, because the mean of its divisors is an integer number (15562560).

Almost surely, 2^31125119 is an apocalyptic number.

31125119 is a deficient number, since it is larger than the sum of its proper divisors (1).

31125119 is an equidigital number, since it uses as much as digits as its factorization.

31125119 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 270, while the sum is 23.

The square root of 31125119 is about 5578.9890661302. The cubic root of 31125119 is about 314.5601284620.

The spelling of 31125119 in words is "thirty-one million, one hundred twenty-five thousand, one hundred nineteen".