125431121 has 8 divisors (see below), whose sum is σ = 131013504. Its totient is φ = 119859520.

The previous prime is 125431079. The next prime is 125431127. The reversal of 125431121 is 121134521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125431121 is a prime.

It is a super-2 number, since 2×125431121² = 31465932230633282, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 125431093 and 125431102.

It is not an unprimeable number, because it can be changed into a prime (125431127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29300 + ... + 33306.

It is an arithmetic number, because the mean of its divisors is an integer number (16376688).

Almost surely, 2^125431121 is an apocalyptic number.

It is an amenable number.

125431121 is a deficient number, since it is larger than the sum of its proper divisors (5582383).

125431121 is a wasteful number, since it uses less digits than its factorization.

125431121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5391.

The product of its digits is 240, while the sum is 20.

The square root of 125431121 is about 11199.6036090569. The cubic root of 125431121 is about 500.5741684089.

Adding to 125431121 its reverse (121134521), we get a palindrome (246565642).

It can be divided in two parts, 125431 and 121, that multiplied together give a palindrome (15177151).

The spelling of 125431121 in words is "one hundred twenty-five million, four hundred thirty-one thousand, one hundred twenty-one".