216723037 has 2 divisors, whose sum is σ = 216723038. Its totient is φ = 216723036.

The previous prime is 216723019. The next prime is 216723079. The reversal of 216723037 is 730327612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118831801 + 97891236 = 10901^2 + 9894^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216723037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216723337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108361518 + 108361519.

It is an arithmetic number, because the mean of its divisors is an integer number (108361519).

Almost surely, 2^216723037 is an apocalyptic number.

It is an amenable number.

216723037 is a deficient number, since it is larger than the sum of its proper divisors (1).

216723037 is an equidigital number, since it uses as much as digits as its factorization.

216723037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 31.

The square root of 216723037 is about 14721.5161243671. The cubic root of 216723037 is about 600.6687330869.

The spelling of 216723037 in words is "two hundred sixteen million, seven hundred twenty-three thousand, thirty-seven".