1201431123 has 48 divisors (see below), whose sum is σ = 2005960320. Its totient is φ = 714116736.

The previous prime is 1201431113. The next prime is 1201431139. The reversal of 1201431123 is 3211341021.

It is not a de Polignac number, because 1201431123 - 2⁹ = 1201430611 is a prime.

It is a super-2 number, since 2×1201431123² = 2886873486626082258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1201431096 and 1201431105.

It is not an unprimeable number, because it can be changed into a prime (1201431103) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 70836 + ... + 86142.

It is an arithmetic number, because the mean of its divisors is an integer number (41790840).

Almost surely, 2^1201431123 is an apocalyptic number.

1201431123 is a deficient number, since it is larger than the sum of its proper divisors (804529197).

1201431123 is a wasteful number, since it uses less digits than its factorization.

1201431123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15358 (or 15346 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1201431123 is about 34661.6664775368. Note that the first 3 decimals coincide. The cubic root of 1201431123 is about 1063.0808444470.

Adding to 1201431123 its reverse (3211341021), we get a palindrome (4412772144).

The spelling of 1201431123 in words is "one billion, two hundred one million, four hundred thirty-one thousand, one hundred twenty-three".