125311111 has 2 divisors, whose sum is σ = 125311112. Its totient is φ = 125311110.

The previous prime is 125311093. The next prime is 125311127. The reversal of 125311111 is 111113521.

It is a happy number.

It is an a-pointer prime, because the next prime (125311127) can be obtained adding 125311111 to its sum of digits (16).

It is a strong prime.

It is an emirp because it is prime and its reverse (111113521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125311111 - 2¹⁷ = 125180039 is a prime.

125311111 is a modest number, since divided by 11111 gives 1253 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125311171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62655555 + 62655556.

It is an arithmetic number, because the mean of its divisors is an integer number (62655556).

Almost surely, 2^125311111 is an apocalyptic number.

125311111 is a deficient number, since it is larger than the sum of its proper divisors (1).

125311111 is an equidigital number, since it uses as much as digits as its factorization.

125311111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30, while the sum is 16.

The square root of 125311111 is about 11194.2445479809. The cubic root of 125311111 is about 500.4144709993.

Adding to 125311111 its reverse (111113521), we get a palindrome (236424632).

The spelling of 125311111 in words is "one hundred twenty-five million, three hundred eleven thousand, one hundred eleven".