125031121 has 2 divisors, whose sum is σ = 125031122. Its totient is φ = 125031120.

The previous prime is 125031097. The next prime is 125031131. The reversal of 125031121 is 121130521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119574225 + 5456896 = 10935^2 + 2336^2 .

It is an emirp because it is prime and its reverse (121130521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125031121 - 2⁷ = 125030993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 125031095 and 125031104.

It is not a weakly prime, because it can be changed into another prime (125031131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62515560 + 62515561.

It is an arithmetic number, because the mean of its divisors is an integer number (62515561).

Almost surely, 2^125031121 is an apocalyptic number.

It is an amenable number.

125031121 is a deficient number, since it is larger than the sum of its proper divisors (1).

125031121 is an equidigital number, since it uses as much as digits as its factorization.

125031121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 125031121 is about 11181.7315743135. The cubic root of 125031121 is about 500.0414912235.

Adding to 125031121 its reverse (121130521), we get a palindrome (246161642).

The spelling of 125031121 in words is "one hundred twenty-five million, thirty-one thousand, one hundred twenty-one".