431989135 has 4 divisors (see below), whose sum is σ = 518386968. Its totient is φ = 345591304.

The previous prime is 431989049. The next prime is 431989139. The reversal of 431989135 is 531989134.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-431989135 is a prime.

It is a super-2 number, since 2×431989135² = 373229225516096450, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 431989091 and 431989100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431989139) 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, 43198909 + ... + 43198918.

It is an arithmetic number, because the mean of its divisors is an integer number (129596742).

Almost surely, 2^431989135 is an apocalyptic number.

431989135 is a deficient number, since it is larger than the sum of its proper divisors (86397833).

431989135 is an equidigital number, since it uses as much as digits as its factorization.

431989135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86397832.

The product of its digits is 116640, while the sum is 43.

The square root of 431989135 is about 20784.3483179050. The cubic root of 431989135 is about 755.9462923643.

Subtracting 431989135 from its reverse (531989134), we obtain a palindrome (99999999).

The spelling of 431989135 in words is "four hundred thirty-one million, nine hundred eighty-nine thousand, one hundred thirty-five".