125122215311 has 4 divisors (see below), whose sum is σ = 125122964952. Its totient is φ = 125121465672.

The previous prime is 125122215293. The next prime is 125122215313. The reversal of 125122215311 is 113512221521.

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: 113512221521 = 25943 ⋅4375447.

It is a cyclic number.

It is not a de Polignac number, because 125122215311 - 2¹⁸ = 125121953167 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 (125122215313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1460 + ... + 500246.

It is an arithmetic number, because the mean of its divisors is an integer number (31280741238).

Almost surely, 2^125122215311 is an apocalyptic number.

125122215311 is a deficient number, since it is larger than the sum of its proper divisors (749641).

125122215311 is an equidigital number, since it uses as much as digits as its factorization.

125122215311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749640.

The product of its digits is 1200, while the sum is 26.

Adding to 125122215311 its reverse (113512221521), we get a palindrome (238634436832).

The spelling of 125122215311 in words is "one hundred twenty-five billion, one hundred twenty-two million, two hundred fifteen thousand, three hundred eleven".