1220031011 has 4 divisors (see below), whose sum is σ = 1221486000. Its totient is φ = 1218576024.

The previous prime is 1220030989. The next prime is 1220031017. The reversal of 1220031011 is 1101300221.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220031011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220030983 and 1220031001.

It is not an unprimeable number, because it can be changed into a prime (1220031017) 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, 726236 + ... + 727913.

It is an arithmetic number, because the mean of its divisors is an integer number (305371500).

Almost surely, 2^1220031011 is an apocalyptic number.

1220031011 is a deficient number, since it is larger than the sum of its proper divisors (1454989).

1220031011 is an equidigital number, since it uses as much as digits as its factorization.

1220031011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1454988.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1220031011 is about 34928.9423114986. The cubic root of 1220031011 is about 1068.5387836720.

Adding to 1220031011 its reverse (1101300221), we get a palindrome (2321331232).

The spelling of 1220031011 in words is "one billion, two hundred twenty million, thirty-one thousand, eleven".