125121717231 has 16 divisors (see below), whose sum is σ = 190677080064. Its totient is φ = 71492343264.

The previous prime is 125121717179. The next prime is 125121717251. The reversal of 125121717231 is 132717121521.

It is not a de Polignac number, because 125121717231 - 2¹⁰ = 125121716207 is a prime.

It is a super-2 number, since 2×125121717231² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 125121717192 and 125121717201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125121717251) 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 15 ways as a sum of consecutive naturals, for example, 32245 + ... + 501281.

It is an arithmetic number, because the mean of its divisors is an integer number (11917317504).

Almost surely, 2^125121717231 is an apocalyptic number.

125121717231 is a deficient number, since it is larger than the sum of its proper divisors (65555362833).

125121717231 is a wasteful number, since it uses less digits than its factorization.

125121717231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481750.

The product of its digits is 5880, while the sum is 33.

Adding to 125121717231 its reverse (132717121521), we get a palindrome (257838838752).

The spelling of 125121717231 in words is "one hundred twenty-five billion, one hundred twenty-one million, seven hundred seventeen thousand, two hundred thirty-one".