216507701 has 2 divisors, whose sum is σ = 216507702. Its totient is φ = 216507700.

The previous prime is 216507691. The next prime is 216507737. The reversal of 216507701 is 107705612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138627076 + 77880625 = 11774^2 + 8825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216507701 is a prime.

It is a super-3 number, since 3×216507701³ (a number of 26 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216507001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108253850 + 108253851.

It is an arithmetic number, because the mean of its divisors is an integer number (108253851).

Almost surely, 2^216507701 is an apocalyptic number.

It is an amenable number.

216507701 is a deficient number, since it is larger than the sum of its proper divisors (1).

216507701 is an equidigital number, since it uses as much as digits as its factorization.

216507701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2940, while the sum is 29.

The square root of 216507701 is about 14714.2006578679. The cubic root of 216507701 is about 600.4697256855.

The spelling of 216507701 in words is "two hundred sixteen million, five hundred seven thousand, seven hundred one".