531155389 has 2 divisors, whose sum is σ = 531155390. Its totient is φ = 531155388.

The previous prime is 531155363. The next prime is 531155489. The reversal of 531155389 is 983551135.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 459888025 + 71267364 = 21445^2 + 8442^2 .

It is a cyclic number.

It is not a de Polignac number, because 531155389 - 2¹⁵ = 531122621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531155309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265577694 + 265577695.

It is an arithmetic number, because the mean of its divisors is an integer number (265577695).

Almost surely, 2^531155389 is an apocalyptic number.

It is an amenable number.

531155389 is a deficient number, since it is larger than the sum of its proper divisors (1).

531155389 is an equidigital number, since it uses as much as digits as its factorization.

531155389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81000, while the sum is 40.

The square root of 531155389 is about 23046.8086510909. The cubic root of 531155389 is about 809.8548685768.

The spelling of 531155389 in words is "five hundred thirty-one million, one hundred fifty-five thousand, three hundred eighty-nine".