125997121 has 4 divisors (see below), whose sum is σ = 126023044. Its totient is φ = 125971200.

The previous prime is 125997107. The next prime is 125997167. The reversal of 125997121 is 121799521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 80299521 + 45697600 = 8961^2 + 6760^2 .

It is a 3-Lehmer number, since φ(125997121) divides (125997121-1)³.

It is a cyclic number.

It is not a de Polignac number, because 125997121 - 2⁵ = 125997089 is a prime.

It is a deceptive number, since it divides R_125997120.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125997191) 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, 3240 + ... + 16201.

It is an arithmetic number, because the mean of its divisors is an integer number (31505761).

Almost surely, 2^125997121 is an apocalyptic number.

125997121 is the 6481-st octagonal number.

It is an amenable number.

125997121 is a deficient number, since it is larger than the sum of its proper divisors (25923).

125997121 is an equidigital number, since it uses as much as digits as its factorization.

125997121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25922.

The product of its digits is 11340, while the sum is 37.

The square root of 125997121 is about 11224.8439187367. The cubic root of 125997121 is about 501.3259751381.

The spelling of 125997121 in words is "one hundred twenty-five million, nine hundred ninety-seven thousand, one hundred twenty-one".