216570131 has 4 divisors (see below), whose sum is σ = 217780200. Its totient is φ = 215360064.

The previous prime is 216570103. The next prime is 216570143. The reversal of 216570131 is 131075612.

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

It is a cyclic number.

It is not a de Polignac number, because 216570131 - 2¹⁴ = 216553747 is a prime.

It is a super-2 number, since 2×216570131² = 93805243282714322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216570131.

It is not an unprimeable number, because it can be changed into a prime (216570161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 604766 + ... + 605123.

It is an arithmetic number, because the mean of its divisors is an integer number (54445050).

Almost surely, 2^216570131 is an apocalyptic number.

216570131 is a deficient number, since it is larger than the sum of its proper divisors (1210069).

216570131 is a wasteful number, since it uses less digits than its factorization.

216570131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1210068.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 216570131 is about 14716.3219249920. The cubic root of 216570131 is about 600.5274352916.

The spelling of 216570131 in words is "two hundred sixteen million, five hundred seventy thousand, one hundred thirty-one".