1121204431 has 4 divisors (see below), whose sum is σ = 1121353632. Its totient is φ = 1121055232.

The previous prime is 1121204393. The next prime is 1121204443. The reversal of 1121204431 is 1344021211.

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

It is a cyclic number.

It is not a de Polignac number, because 1121204431 - 2¹³ = 1121196239 is a prime.

It is a super-2 number, since 2×1121204431² = 2514198752188067522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1121204399 and 1121204408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121204471) 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, 62695 + ... + 78568.

It is an arithmetic number, because the mean of its divisors is an integer number (280338408).

Almost surely, 2^1121204431 is an apocalyptic number.

1121204431 is a deficient number, since it is larger than the sum of its proper divisors (149201).

1121204431 is an equidigital number, since it uses as much as digits as its factorization.

1121204431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149200.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1121204431 is about 33484.3908560392. The cubic root of 1121204431 is about 1038.8709489644.

Adding to 1121204431 its reverse (1344021211), we get a palindrome (2465225642).

The spelling of 1121204431 in words is "one billion, one hundred twenty-one million, two hundred four thousand, four hundred thirty-one".