1121391 has 16 divisors (see below), whose sum is σ = 1703520. Its totient is φ = 728640.

The previous prime is 1121389. The next prime is 1121423. The reversal of 1121391 is 1931211.

It is not a de Polignac number, because 1121391 - 2¹ = 1121389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121191) 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 15 ways as a sum of consecutive naturals, for example, 601 + ... + 1613.

It is an arithmetic number, because the mean of its divisors is an integer number (106470).

2^1121391 is an apocalyptic number.

1121391 is a deficient number, since it is larger than the sum of its proper divisors (582129).

1121391 is a wasteful number, since it uses less digits than its factorization.

1121391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063 (or 1057 counting only the distinct ones).

The product of its digits is 54, while the sum is 18.

The square root of 1121391 is about 1058.9575062296. The cubic root of 1121391 is about 103.8928568657.

The spelling of 1121391 in words is "one million, one hundred twenty-one thousand, three hundred ninety-one".