125770121 has 2 divisors, whose sum is σ = 125770122. Its totient is φ = 125770120.

The previous prime is 125770109. The next prime is 125770147. The reversal of 125770121 is 121077521.

It is an a-pointer prime, because the next prime (125770147) can be obtained adding 125770121 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70476025 + 55294096 = 8395^2 + 7436^2 .

It is a cyclic number.

It is not a de Polignac number, because 125770121 - 2¹⁴ = 125753737 is a prime.

It is equal to p_7151435 and since 125770121 and 7151435 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (125770171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62885060 + 62885061.

It is an arithmetic number, because the mean of its divisors is an integer number (62885061).

Almost surely, 2^125770121 is an apocalyptic number.

It is an amenable number.

125770121 is a deficient number, since it is larger than the sum of its proper divisors (1).

125770121 is an equidigital number, since it uses as much as digits as its factorization.

125770121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 980, while the sum is 26.

The square root of 125770121 is about 11214.7278611654. The cubic root of 125770121 is about 501.0247264368.

The spelling of 125770121 in words is "one hundred twenty-five million, seven hundred seventy thousand, one hundred twenty-one".