125512091 has 2 divisors, whose sum is σ = 125512092. Its totient is φ = 125512090.

The previous prime is 125512073. The next prime is 125512147. The reversal of 125512091 is 190215521.

It is a weak prime.

It is an emirp because it is prime and its reverse (190215521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125512091 - 2⁶ = 125512027 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 125512091.

It is not a weakly prime, because it can be changed into another prime (125512001) 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, 62756045 + 62756046.

It is an arithmetic number, because the mean of its divisors is an integer number (62756046).

Almost surely, 2^125512091 is an apocalyptic number.

125512091 is a deficient number, since it is larger than the sum of its proper divisors (1).

125512091 is an equidigital number, since it uses as much as digits as its factorization.

125512091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 125512091 is about 11203.2178859469. The cubic root of 125512091 is about 500.6818577174.

The spelling of 125512091 in words is "one hundred twenty-five million, five hundred twelve thousand, ninety-one".