211512749 has 4 divisors (see below), whose sum is σ = 241728864. Its totient is φ = 181296636.

The previous prime is 211512713. The next prime is 211512767. The reversal of 211512749 is 947215112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211512749 - 2²⁰ = 210464173 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 (211512709) 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, 15108047 + ... + 15108060.

It is an arithmetic number, because the mean of its divisors is an integer number (60432216).

Almost surely, 2^211512749 is an apocalyptic number.

It is an amenable number.

211512749 is a deficient number, since it is larger than the sum of its proper divisors (30216115).

211512749 is an equidigital number, since it uses as much as digits as its factorization.

211512749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30216114.

The product of its digits is 5040, while the sum is 32.

The square root of 211512749 is about 14543.4778852928. The cubic root of 211512749 is about 595.8160297690.

The spelling of 211512749 in words is "two hundred eleven million, five hundred twelve thousand, seven hundred forty-nine".