125513891 has 2 divisors, whose sum is σ = 125513892. Its totient is φ = 125513890.

The previous prime is 125513881. The next prime is 125513893. The reversal of 125513891 is 198315521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 125513891 - 2¹⁰ = 125512867 is a prime.

Together with 125513893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (125513893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62756945 + 62756946.

It is an arithmetic number, because the mean of its divisors is an integer number (62756946).

Almost surely, 2^125513891 is an apocalyptic number.

125513891 is a deficient number, since it is larger than the sum of its proper divisors (1).

125513891 is an equidigital number, since it uses as much as digits as its factorization.

125513891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 35.

The square root of 125513891 is about 11203.2982197208. The cubic root of 125513891 is about 500.6842511735.

The spelling of 125513891 in words is "one hundred twenty-five million, five hundred thirteen thousand, eight hundred ninety-one".