125029381121 has 2 divisors, whose sum is σ = 125029381122. Its totient is φ = 125029381120.

The previous prime is 125029381111. The next prime is 125029381157. The reversal of 125029381121 is 121183920521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121218170896 + 3811210225 = 348164^2 + 61735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125029381121 is a prime.

It is a super-2 number, since 2×125029381121² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (125029381111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62514690560 + 62514690561.

It is an arithmetic number, because the mean of its divisors is an integer number (62514690561).

Almost surely, 2^125029381121 is an apocalyptic number.

It is an amenable number.

125029381121 is a deficient number, since it is larger than the sum of its proper divisors (1).

125029381121 is an equidigital number, since it uses as much as digits as its factorization.

125029381121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 35.

The spelling of 125029381121 in words is "one hundred twenty-five billion, twenty-nine million, three hundred eighty-one thousand, one hundred twenty-one".