125506391 has 2 divisors, whose sum is σ = 125506392. Its totient is φ = 125506390.

The previous prime is 125506363. The next prime is 125506411. The reversal of 125506391 is 193605521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 125506391 - 2⁶ = 125506327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125506301) 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, 62753195 + 62753196.

It is an arithmetic number, because the mean of its divisors is an integer number (62753196).

Almost surely, 2^125506391 is an apocalyptic number.

125506391 is a deficient number, since it is larger than the sum of its proper divisors (1).

125506391 is an equidigital number, since it uses as much as digits as its factorization.

125506391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 125506391 is about 11202.9634918623. The cubic root of 125506391 is about 500.6742782888.

The spelling of 125506391 in words is "one hundred twenty-five million, five hundred six thousand, three hundred ninety-one".