11121639 has 4 divisors (see below), whose sum is σ = 14828856. Its totient is φ = 7414424.

The previous prime is 11121637. The next prime is 11121647. The reversal of 11121639 is 93612111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93612111 = 3 ⋅31204037.

It is a cyclic number.

It is not a de Polignac number, because 11121639 - 2¹ = 11121637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1853604 + ... + 1853609.

It is an arithmetic number, because the mean of its divisors is an integer number (3707214).

Almost surely, 2^11121639 is an apocalyptic number.

11121639 is a deficient number, since it is larger than the sum of its proper divisors (3707217).

11121639 is an equidigital number, since it uses as much as digits as its factorization.

11121639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3707216.

The product of its digits is 324, while the sum is 24.

The square root of 11121639 is about 3334.9121427708. The cubic root of 11121639 is about 223.2147716037.

The spelling of 11121639 in words is "eleven million, one hundred twenty-one thousand, six hundred thirty-nine".