531155139989 has 2 divisors, whose sum is σ = 531155139990. Its totient is φ = 531155139988.

The previous prime is 531155139979. The next prime is 531155140039. The reversal of 531155139989 is 989931551135.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 276483517489 + 254671622500 = 525817^2 + 504650^2 .

It is a cyclic number.

It is not a de Polignac number, because 531155139989 - 2⁴ = 531155139973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531155139979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265577569994 + 265577569995.

It is an arithmetic number, because the mean of its divisors is an integer number (265577569995).

Almost surely, 2^531155139989 is an apocalyptic number.

It is an amenable number.

531155139989 is a deficient number, since it is larger than the sum of its proper divisors (1).

531155139989 is an equidigital number, since it uses as much as digits as its factorization.

531155139989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6561000, while the sum is 59.

The spelling of 531155139989 in words is "five hundred thirty-one billion, one hundred fifty-five million, one hundred thirty-nine thousand, nine hundred eighty-nine".