213661965 has 32 divisors (see below), whose sum is σ = 376659072. Its totient is φ = 102560000.

The previous prime is 213661961. The next prime is 213661979. The reversal of 213661965 is 569166312.

213661965 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 213661965 - 2² = 213661961 is a prime.

It is a super-2 number, since 2×213661965² = 91302870575322450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213661961) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10255 + ... + 23075.

It is an arithmetic number, because the mean of its divisors is an integer number (11770596).

Almost surely, 2^213661965 is an apocalyptic number.

It is an amenable number.

213661965 is a deficient number, since it is larger than the sum of its proper divisors (162997107).

213661965 is a wasteful number, since it uses less digits than its factorization.

213661965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12941.

The product of its digits is 58320, while the sum is 39.

The square root of 213661965 is about 14617.1804736755. The cubic root of 213661965 is about 597.8272945262.

The spelling of 213661965 in words is "two hundred thirteen million, six hundred sixty-one thousand, nine hundred sixty-five".