216195137 has 4 divisors (see below), whose sum is σ = 228912516. Its totient is φ = 203477760.

The previous prime is 216195127. The next prime is 216195139. The reversal of 216195137 is 731591612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 188485441 + 27709696 = 13729^2 + 5264^2 .

It is not a de Polignac number, because 216195137 - 2⁶ = 216195073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216195097 and 216195106.

It is not an unprimeable number, because it can be changed into a prime (216195139) 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, 6358664 + ... + 6358697.

It is an arithmetic number, because the mean of its divisors is an integer number (57228129).

Almost surely, 2^216195137 is an apocalyptic number.

It is an amenable number.

216195137 is a deficient number, since it is larger than the sum of its proper divisors (12717379).

216195137 is a wasteful number, since it uses less digits than its factorization.

216195137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12717378.

The product of its digits is 11340, while the sum is 35.

The square root of 216195137 is about 14703.5756535613. The cubic root of 216195137 is about 600.1806280245.

The spelling of 216195137 in words is "two hundred sixteen million, one hundred ninety-five thousand, one hundred thirty-seven".