125975021 has 2 divisors, whose sum is σ = 125975022. Its totient is φ = 125975020.

The previous prime is 125974991. The next prime is 125975023. The reversal of 125975021 is 120579521.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112572100 + 13402921 = 10610^2 + 3661^2 .

It is a cyclic number.

It is not a de Polignac number, because 125975021 - 2⁶ = 125974957 is a prime.

Together with 125975023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125975023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62987510 + 62987511.

It is an arithmetic number, because the mean of its divisors is an integer number (62987511).

Almost surely, 2^125975021 is an apocalyptic number.

It is an amenable number.

125975021 is a deficient number, since it is larger than the sum of its proper divisors (1).

125975021 is an equidigital number, since it uses as much as digits as its factorization.

125975021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6300, while the sum is 32.

The square root of 125975021 is about 11223.8594520780. The cubic root of 125975021 is about 501.2966624263.

The spelling of 125975021 in words is "one hundred twenty-five million, nine hundred seventy-five thousand, twenty-one".