531216139 has 2 divisors, whose sum is σ = 531216140. Its totient is φ = 531216138.

The previous prime is 531216083. The next prime is 531216157. The reversal of 531216139 is 931612135.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 531216139 - 2¹⁷ = 531085067 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 531216139.

It is not a weakly prime, because it can be changed into another prime (531216199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265608069 + 265608070.

It is an arithmetic number, because the mean of its divisors is an integer number (265608070).

Almost surely, 2^531216139 is an apocalyptic number.

531216139 is a deficient number, since it is larger than the sum of its proper divisors (1).

531216139 is an equidigital number, since it uses as much as digits as its factorization.

531216139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4860, while the sum is 31.

The square root of 531216139 is about 23048.1265833039. The cubic root of 531216139 is about 809.8857426604.

The spelling of 531216139 in words is "five hundred thirty-one million, two hundred sixteen thousand, one hundred thirty-nine".