125556401 has 2 divisors, whose sum is σ = 125556402. Its totient is φ = 125556400.

The previous prime is 125556397. The next prime is 125556437. The reversal of 125556401 is 104655521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124992400 + 564001 = 11180^2 + 751^2 .

It is a cyclic number.

It is not a de Polignac number, because 125556401 - 2² = 125556397 is a prime.

It is not a weakly prime, because it can be changed into another prime (125556461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62778200 + 62778201.

It is an arithmetic number, because the mean of its divisors is an integer number (62778201).

Almost surely, 2^125556401 is an apocalyptic number.

It is an amenable number.

125556401 is a deficient number, since it is larger than the sum of its proper divisors (1).

125556401 is an equidigital number, since it uses as much as digits as its factorization.

125556401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 125556401 is about 11205.1952682673. The cubic root of 125556401 is about 500.7407699777.

The spelling of 125556401 in words is "one hundred twenty-five million, five hundred fifty-six thousand, four hundred one".