216501377 has 4 divisors (see below), whose sum is σ = 216665856. Its totient is φ = 216336900.

The previous prime is 216501349. The next prime is 216501379. The reversal of 216501377 is 773105612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216501377 - 2⁸ = 216501121 is a prime.

It is a super-2 number, since 2×216501377² = 93745692485792258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216501379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80249 + ... + 82902.

It is an arithmetic number, because the mean of its divisors is an integer number (54166464).

Almost surely, 2^216501377 is an apocalyptic number.

It is an amenable number.

216501377 is a deficient number, since it is larger than the sum of its proper divisors (164479).

216501377 is a wasteful number, since it uses less digits than its factorization.

216501377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164478.

The product of its (nonzero) digits is 8820, while the sum is 32.

The square root of 216501377 is about 14713.9857618526. The cubic root of 216501377 is about 600.4638792306.

Adding to 216501377 its reverse (773105612), we get a palindrome (989606989).

The spelling of 216501377 in words is "two hundred sixteen million, five hundred one thousand, three hundred seventy-seven".