211840749 has 12 divisors (see below), whose sum is σ = 307763196. Its totient is φ = 140409792.

The previous prime is 211840729. The next prime is 211840753. The reversal of 211840749 is 947048112.

It can be written as a sum of positive squares in 2 ways, for example, as 107433225 + 104407524 = 10365^2 + 10218^2 .

It is a de Polignac number, because none of the positive numbers 2^k-211840749 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211840729) 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, 66472 + ... + 69585.

It is an arithmetic number, because the mean of its divisors is an integer number (25646933).

Almost surely, 2^211840749 is an apocalyptic number.

It is an amenable number.

211840749 is a deficient number, since it is larger than the sum of its proper divisors (95922447).

211840749 is a wasteful number, since it uses less digits than its factorization.

211840749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136236 (or 136233 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 211840749 is about 14554.7500493825. The cubic root of 211840749 is about 596.1238547533.

The spelling of 211840749 in words is "two hundred eleven million, eight hundred forty thousand, seven hundred forty-nine".