125509987 has 2 divisors, whose sum is σ = 125509988. Its totient is φ = 125509986.

The previous prime is 125509981. The next prime is 125510003. The reversal of 125509987 is 789905521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 125509987 - 2⁷ = 125509859 is a prime.

It is not a weakly prime, because it can be changed into another prime (125509981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62754993 + 62754994.

It is an arithmetic number, because the mean of its divisors is an integer number (62754994).

Almost surely, 2^125509987 is an apocalyptic number.

125509987 is a deficient number, since it is larger than the sum of its proper divisors (1).

125509987 is an equidigital number, since it uses as much as digits as its factorization.

125509987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 226800, while the sum is 46.

The square root of 125509987 is about 11203.1239839609. The cubic root of 125509987 is about 500.6790600042.

The spelling of 125509987 in words is "one hundred twenty-five million, five hundred nine thousand, nine hundred eighty-seven".