125555491 has 2 divisors, whose sum is σ = 125555492. Its totient is φ = 125555490.

The previous prime is 125555483. The next prime is 125555501. The reversal of 125555491 is 194555521.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 125555491 - 2³ = 125555483 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 125555491.

It is not a weakly prime, because it can be changed into another prime (125555461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62777745 + 62777746.

It is an arithmetic number, because the mean of its divisors is an integer number (62777746).

Almost surely, 2^125555491 is an apocalyptic number.

125555491 is a deficient number, since it is larger than the sum of its proper divisors (1).

125555491 is an equidigital number, since it uses as much as digits as its factorization.

125555491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45000, while the sum is 37.

The square root of 125555491 is about 11205.1546620294. The cubic root of 125555491 is about 500.7395602287.

The spelling of 125555491 in words is "one hundred twenty-five million, five hundred fifty-five thousand, four hundred ninety-one".