125889121 has 4 divisors (see below), whose sum is σ = 126180292. Its totient is φ = 125597952.

The previous prime is 125889091. The next prime is 125889139. The reversal of 125889121 is 121988521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121988521 = 151 ⋅807871.

It can be written as a sum of positive squares in 2 ways, for example, as 11826721 + 114062400 = 3439^2 + 10680^2 .

It is a cyclic number.

It is not a de Polignac number, because 125889121 - 2¹³ = 125880929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125889161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144936 + ... + 145801.

It is an arithmetic number, because the mean of its divisors is an integer number (31545073).

Almost surely, 2^125889121 is an apocalyptic number.

It is an amenable number.

125889121 is a deficient number, since it is larger than the sum of its proper divisors (291171).

125889121 is an equidigital number, since it uses as much as digits as its factorization.

125889121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291170.

The product of its digits is 11520, while the sum is 37.

The square root of 125889121 is about 11220.0321300788. The cubic root of 125889121 is about 501.1826949263.

The spelling of 125889121 in words is "one hundred twenty-five million, eight hundred eighty-nine thousand, one hundred twenty-one".