211561463 has 4 divisors (see below), whose sum is σ = 213176568. Its totient is φ = 209946360.

The previous prime is 211561459. The next prime is 211561487. The reversal of 211561463 is 364165112.

It is a happy number.

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 211561463 - 2² = 211561459 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211561403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 807356 + ... + 807617.

It is an arithmetic number, because the mean of its divisors is an integer number (53294142).

Almost surely, 2^211561463 is an apocalyptic number.

211561463 is a deficient number, since it is larger than the sum of its proper divisors (1615105).

211561463 is a wasteful number, since it uses less digits than its factorization.

211561463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1615104.

The product of its digits is 4320, while the sum is 29.

The square root of 211561463 is about 14545.1525602174. The cubic root of 211561463 is about 595.8617675228.

The spelling of 211561463 in words is "two hundred eleven million, five hundred sixty-one thousand, four hundred sixty-three".