216732539 has 2 divisors, whose sum is σ = 216732540. Its totient is φ = 216732538.

The previous prime is 216732499. The next prime is 216732559. The reversal of 216732539 is 935237612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216732539 is a prime.

It is a super-2 number, since 2×216732539² = 93945986922773042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (216732559) 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, 108366269 + 108366270.

It is an arithmetic number, because the mean of its divisors is an integer number (108366270).

Almost surely, 2^216732539 is an apocalyptic number.

216732539 is a deficient number, since it is larger than the sum of its proper divisors (1).

216732539 is an equidigital number, since it uses as much as digits as its factorization.

216732539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 38.

The square root of 216732539 is about 14721.8388457421. The cubic root of 216732539 is about 600.6775115274.

The spelling of 216732539 in words is "two hundred sixteen million, seven hundred thirty-two thousand, five hundred thirty-nine".