213550131 has 4 divisors (see below), whose sum is σ = 284733512. Its totient is φ = 142366752.

The previous prime is 213550111. The next prime is 213550157. The reversal of 213550131 is 131055312.

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

It is not a de Polignac number, because 213550131 - 2⁶ = 213550067 is a prime.

It is a super-2 number, since 2×213550131² = 91207316900234322, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 213550098 and 213550107.

It is not an unprimeable number, because it can be changed into a prime (213550111) 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, 35591686 + ... + 35591691.

It is an arithmetic number, because the mean of its divisors is an integer number (71183378).

Almost surely, 2^213550131 is an apocalyptic number.

213550131 is a deficient number, since it is larger than the sum of its proper divisors (71183381).

213550131 is an equidigital number, since it uses as much as digits as its factorization.

213550131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71183380.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 213550131 is about 14613.3545430199. The cubic root of 213550131 is about 597.7229722839.

The spelling of 213550131 in words is "two hundred thirteen million, five hundred fifty thousand, one hundred thirty-one".