1231722125 has 16 divisors (see below), whose sum is σ = 1542665280. Its totient is φ = 981867600.

The previous prime is 1231722103. The next prime is 1231722157. The reversal of 1231722125 is 5212271321.

It is not a de Polignac number, because 1231722125 - 2¹² = 1231718029 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1231722094 and 1231722103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17966 + ... + 52784.

It is an arithmetic number, because the mean of its divisors is an integer number (96416580).

Almost surely, 2^1231722125 is an apocalyptic number.

It is an amenable number.

1231722125 is a deficient number, since it is larger than the sum of its proper divisors (310943155).

1231722125 is an equidigital number, since it uses as much as digits as its factorization.

1231722125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35117 (or 35107 counting only the distinct ones).

The product of its digits is 1680, while the sum is 26.

The square root of 1231722125 is about 35095.8989769460. The cubic root of 1231722125 is about 1071.9410787234.

Adding to 1231722125 its reverse (5212271321), we get a palindrome (6443993446).

The spelling of 1231722125 in words is "one billion, two hundred thirty-one million, seven hundred twenty-two thousand, one hundred twenty-five".