216342553 has 4 divisors (see below), whose sum is σ = 247248640. Its totient is φ = 185436468.

The previous prime is 216342547. The next prime is 216342559. The reversal of 216342553 is 355243612.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (216342547) and next prime (216342559).

It is a de Polignac number, because none of the positive numbers 2^k-216342553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216342559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15453033 + ... + 15453046.

It is an arithmetic number, because the mean of its divisors is an integer number (61812160).

Almost surely, 2^216342553 is an apocalyptic number.

It is an amenable number.

216342553 is a deficient number, since it is larger than the sum of its proper divisors (30906087).

216342553 is an equidigital number, since it uses as much as digits as its factorization.

216342553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30906086.

The product of its digits is 21600, while the sum is 31.

The square root of 216342553 is about 14708.5877296224. The cubic root of 216342553 is about 600.3170111807.

The spelling of 216342553 in words is "two hundred sixteen million, three hundred forty-two thousand, five hundred fifty-three".