431031121 has 4 divisors (see below), whose sum is σ = 431619892. Its totient is φ = 430442352.

The previous prime is 431031119. The next prime is 431031163. The reversal of 431031121 is 121130134.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 240591121 + 190440000 = 15511^2 + 13800^2 .

It is a cyclic number.

It is not a de Polignac number, because 431031121 - 2¹ = 431031119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 431031095 and 431031104.

It is not an unprimeable number, because it can be changed into a prime (431031101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 293286 + ... + 294751.

It is an arithmetic number, because the mean of its divisors is an integer number (107904973).

Almost surely, 2^431031121 is an apocalyptic number.

It is an amenable number.

431031121 is a deficient number, since it is larger than the sum of its proper divisors (588771).

431031121 is an equidigital number, since it uses as much as digits as its factorization.

431031121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588770.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 431031121 is about 20761.2890014084. The cubic root of 431031121 is about 755.3870629095.

Adding to 431031121 its reverse (121130134), we get a palindrome (552161255).

The spelling of 431031121 in words is "four hundred thirty-one million, thirty-one thousand, one hundred twenty-one".