213549971 has 12 divisors (see below), whose sum is σ = 230017752. Its totient is φ = 197531136.

The previous prime is 213549967. The next prime is 213550019. The reversal of 213549971 is 179945312.

213549971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 213549971 - 2² = 213549967 is a prime.

It is a super-2 number, since 2×213549971² = 91207180228201682, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (213545971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 492971 + ... + 493403.

It is an arithmetic number, because the mean of its divisors is an integer number (19168146).

Almost surely, 2^213549971 is an apocalyptic number.

213549971 is a deficient number, since it is larger than the sum of its proper divisors (16467781).

213549971 is an frugal number, since it uses more digits than its factorization.

213549971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950 (or 517 counting only the distinct ones).

The product of its digits is 68040, while the sum is 41.

The square root of 213549971 is about 14613.3490685743. The cubic root of 213549971 is about 597.7228230049.

The spelling of 213549971 in words is "two hundred thirteen million, five hundred forty-nine thousand, nine hundred seventy-one".