1211971 has 4 divisors (see below), whose sum is σ = 1223200. Its totient is φ = 1200744.

The previous prime is 1211933. The next prime is 1211983. The reversal of 1211971 is 1791121.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1211971 - 2⁷ = 1211843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5451 + ... + 5668.

It is an arithmetic number, because the mean of its divisors is an integer number (305800).

2^1211971 is an apocalyptic number.

1211971 is a deficient number, since it is larger than the sum of its proper divisors (11229).

1211971 is a wasteful number, since it uses less digits than its factorization.

1211971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11228.

The product of its digits is 126, while the sum is 22.

The square root of 1211971 is about 1100.8955445454. The cubic root of 1211971 is about 106.6180518482.

The spelling of 1211971 in words is "one million, two hundred eleven thousand, nine hundred seventy-one".