216231653 has 16 divisors (see below), whose sum is σ = 250278336. Its totient is φ = 184631040.

The previous prime is 216231623. The next prime is 216231661. The reversal of 216231653 is 356132612.

It is a de Polignac number, because none of the positive numbers 2^k-216231653 is a prime.

It is a super-2 number, since 2×216231653² = 93512255518224818, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216231623) 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 in 15 ways as a sum of consecutive naturals, for example, 126875 + ... + 128567.

It is an arithmetic number, because the mean of its divisors is an integer number (15642396).

Almost surely, 2^216231653 is an apocalyptic number.

It is an amenable number.

216231653 is a deficient number, since it is larger than the sum of its proper divisors (34046683).

216231653 is a wasteful number, since it uses less digits than its factorization.

216231653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2404.

The product of its digits is 6480, while the sum is 29.

The square root of 216231653 is about 14704.8173399060. The cubic root of 216231653 is about 600.2144168851.

The spelling of 216231653 in words is "two hundred sixteen million, two hundred thirty-one thousand, six hundred fifty-three".