1101220431 has 4 divisors (see below), whose sum is σ = 1468293912. Its totient is φ = 734146952.

The previous prime is 1101220423. The next prime is 1101220433. The reversal of 1101220431 is 1340221011.

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 1101220431 - 2³ = 1101220423 is a prime.

It is a super-2 number, since 2×1101220431² = 2425372875303651522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1101220431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101220433) 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, 183536736 + ... + 183536741.

It is an arithmetic number, because the mean of its divisors is an integer number (367073478).

Almost surely, 2^1101220431 is an apocalyptic number.

1101220431 is a deficient number, since it is larger than the sum of its proper divisors (367073481).

1101220431 is an equidigital number, since it uses as much as digits as its factorization.

1101220431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367073480.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1101220431 is about 33184.6414927147. The cubic root of 1101220431 is about 1032.6617400085.

Adding to 1101220431 its reverse (1340221011), we get a palindrome (2441441442).

The spelling of 1101220431 in words is "one billion, one hundred one million, two hundred twenty thousand, four hundred thirty-one".