431989139 has 2 divisors, whose sum is σ = 431989140. Its totient is φ = 431989138.

The previous prime is 431989049. The next prime is 431989163. The reversal of 431989139 is 931989134.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-431989139 is a prime.

It is a super-2 number, since 2×431989139² = 373229232427922642, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 431989093 and 431989102.

It is not a weakly prime, because it can be changed into another prime (431989189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215994569 + 215994570.

It is an arithmetic number, because the mean of its divisors is an integer number (215994570).

Almost surely, 2^431989139 is an apocalyptic number.

431989139 is a deficient number, since it is larger than the sum of its proper divisors (1).

431989139 is an equidigital number, since it uses as much as digits as its factorization.

431989139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 47.

The square root of 431989139 is about 20784.3484141312. The cubic root of 431989139 is about 755.9462946975.

The spelling of 431989139 in words is "four hundred thirty-one million, nine hundred eighty-nine thousand, one hundred thirty-nine".