211161249 has 40 divisors (see below), whose sum is σ = 342594560. Its totient is φ = 128840544.

The previous prime is 211161241. The next prime is 211161253. The reversal of 211161249 is 942161112.

211161249 is a `hidden beast` number, since 2 + 1 + 1 + 1 + 612 + 49 = 666.

It is not a de Polignac number, because 211161249 - 2³ = 211161241 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211161241) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 132942 + ... + 134520.

It is an arithmetic number, because the mean of its divisors is an integer number (8564864).

Almost surely, 2^211161249 is an apocalyptic number.

It is an amenable number.

211161249 is a deficient number, since it is larger than the sum of its proper divisors (131433311).

211161249 is a wasteful number, since it uses less digits than its factorization.

211161249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1731 (or 1722 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 211161249 is about 14531.3884057925. The cubic root of 211161249 is about 595.4857967921.

The spelling of 211161249 in words is "two hundred eleven million, one hundred sixty-one thousand, two hundred forty-nine".