125428891391 has 4 divisors (see below), whose sum is σ = 125429918784. Its totient is φ = 125427864000.

The previous prime is 125428891349. The next prime is 125428891451. The reversal of 125428891391 is 193198824521.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 193198824521 = 197 ⋅980704693.

It is a cyclic number.

It is not a de Polignac number, because 125428891391 - 2⁶ = 125428891327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125428891321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 301295 + ... + 584496.

It is an arithmetic number, because the mean of its divisors is an integer number (31357479696).

Almost surely, 2^125428891391 is an apocalyptic number.

125428891391 is a deficient number, since it is larger than the sum of its proper divisors (1027393).

125428891391 is an equidigital number, since it uses as much as digits as its factorization.

125428891391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027392.

The product of its digits is 1244160, while the sum is 53.

The spelling of 125428891391 in words is "one hundred twenty-five billion, four hundred twenty-eight million, eight hundred ninety-one thousand, three hundred ninety-one".