216451274 has 16 divisors (see below), whose sum is σ = 352751112. Its totient is φ = 99015168.

The previous prime is 216451267. The next prime is 216451297. The reversal of 216451274 is 472154612.

216451274 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 130759225 + 85692049 = 11435^2 + 9257^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 216451274.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33899 + ... + 39774.

Almost surely, 2^216451274 is an apocalyptic number.

216451274 is a deficient number, since it is larger than the sum of its proper divisors (136299838).

216451274 is a wasteful number, since it uses less digits than its factorization.

216451274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73801.

The product of its digits is 13440, while the sum is 32.

The square root of 216451274 is about 14712.2830995057. The cubic root of 216451274 is about 600.4175556410.

The spelling of 216451274 in words is "two hundred sixteen million, four hundred fifty-one thousand, two hundred seventy-four".