531609139 has 2 divisors, whose sum is σ = 531609140. Its totient is φ = 531609138.

The previous prime is 531609079. The next prime is 531609149. The reversal of 531609139 is 931906135.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 531609139 - 2¹³ = 531600947 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 531609098 and 531609107.

It is not a weakly prime, because it can be changed into another prime (531609149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265804569 + 265804570.

It is an arithmetic number, because the mean of its divisors is an integer number (265804570).

Almost surely, 2^531609139 is an apocalyptic number.

531609139 is a deficient number, since it is larger than the sum of its proper divisors (1).

531609139 is an equidigital number, since it uses as much as digits as its factorization.

531609139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21870, while the sum is 37.

The square root of 531609139 is about 23056.6506457464. The cubic root of 531609139 is about 810.0854144546.

The spelling of 531609139 in words is "five hundred thirty-one million, six hundred nine thousand, one hundred thirty-nine".