125265421 has 2 divisors, whose sum is σ = 125265422. Its totient is φ = 125265420.

The previous prime is 125265377. The next prime is 125265443. The reversal of 125265421 is 124562521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124077321 + 1188100 = 11139^2 + 1090^2 .

It is an emirp because it is prime and its reverse (124562521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125265421 - 2¹³ = 125257229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 125265421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125265821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62632710 + 62632711.

It is an arithmetic number, because the mean of its divisors is an integer number (62632711).

Almost surely, 2^125265421 is an apocalyptic number.

It is an amenable number.

125265421 is a deficient number, since it is larger than the sum of its proper divisors (1).

125265421 is an equidigital number, since it uses as much as digits as its factorization.

125265421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4800, while the sum is 28.

The square root of 125265421 is about 11192.2035810648. The cubic root of 125265421 is about 500.3536444789.

The spelling of 125265421 in words is "one hundred twenty-five million, two hundred sixty-five thousand, four hundred twenty-one".