216134397 has 6 divisors (see below), whose sum is σ = 312194142. Its totient is φ = 144089592.

The previous prime is 216134389. The next prime is 216134417. The reversal of 216134397 is 793431612.

216134397 is a `hidden beast` number, since 2 + 1 + 613 + 4 + 39 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 197290116 + 18844281 = 14046^2 + 4341^2 .

It is not a de Polignac number, because 216134397 - 2³ = 216134389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216134327) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12007458 + ... + 12007475.

It is an arithmetic number, because the mean of its divisors is an integer number (52032357).

Almost surely, 2^216134397 is an apocalyptic number.

It is an amenable number.

216134397 is a deficient number, since it is larger than the sum of its proper divisors (96059745).

216134397 is a wasteful number, since it uses less digits than its factorization.

216134397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24014939 (or 24014936 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 216134397 is about 14701.5100244839. The cubic root of 216134397 is about 600.1244158660.

The spelling of 216134397 in words is "two hundred sixteen million, one hundred thirty-four thousand, three hundred ninety-seven".