1431130121 has 4 divisors (see below), whose sum is σ = 1432421700. Its totient is φ = 1429838544.

The previous prime is 1431130111. The next prime is 1431130153. The reversal of 1431130121 is 1210311341.

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 396607225 + 1034522896 = 19915^2 + 32164^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1431130121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1431130121.

It is not an unprimeable number, because it can be changed into a prime (1431130111) 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, 644126 + ... + 646343.

It is an arithmetic number, because the mean of its divisors is an integer number (358105425).

Almost surely, 2^1431130121 is an apocalyptic number.

It is an amenable number.

1431130121 is a deficient number, since it is larger than the sum of its proper divisors (1291579).

1431130121 is a wasteful number, since it uses less digits than its factorization.

1431130121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1291578.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1431130121 is about 37830.2804774165. The cubic root of 1431130121 is about 1126.9198811821.

Adding to 1431130121 its reverse (1210311341), we get a palindrome (2641441462).

The spelling of 1431130121 in words is "one billion, four hundred thirty-one million, one hundred thirty thousand, one hundred twenty-one".