216732731 has 2 divisors, whose sum is σ = 216732732. Its totient is φ = 216732730.

The previous prime is 216732679. The next prime is 216732751. The reversal of 216732731 is 137237612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216732731 - 2⁶ = 216732667 is a prime.

It is a super-2 number, since 2×216732731² = 93946153373436722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (216732751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108366365 + 108366366.

It is an arithmetic number, because the mean of its divisors is an integer number (108366366).

Almost surely, 2^216732731 is an apocalyptic number.

216732731 is a deficient number, since it is larger than the sum of its proper divisors (1).

216732731 is an equidigital number, since it uses as much as digits as its factorization.

216732731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10584, while the sum is 32.

The square root of 216732731 is about 14721.8453666651. The cubic root of 216732731 is about 600.6776889044.

The spelling of 216732731 in words is "two hundred sixteen million, seven hundred thirty-two thousand, seven hundred thirty-one".