125820031 has 2 divisors, whose sum is σ = 125820032. Its totient is φ = 125820030.

The previous prime is 125820029. The next prime is 125820073. The reversal of 125820031 is 130028521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 125820031 - 2¹ = 125820029 is a prime.

It is a super-2 number, since 2×125820031² = 31661360401681922, which contains 22 as substring.

Together with 125820029, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 125819984 and 125820011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125820131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62910015 + 62910016.

It is an arithmetic number, because the mean of its divisors is an integer number (62910016).

Almost surely, 2^125820031 is an apocalyptic number.

125820031 is a deficient number, since it is larger than the sum of its proper divisors (1).

125820031 is an equidigital number, since it uses as much as digits as its factorization.

125820031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 125820031 is about 11216.9528393410. The cubic root of 125820031 is about 501.0909924064.

Adding to 125820031 its reverse (130028521), we get a palindrome (255848552).

The spelling of 125820031 in words is "one hundred twenty-five million, eight hundred twenty thousand, thirty-one".