1156111420 has 12 divisors (see below), whose sum is σ = 2427834024. Its totient is φ = 462444560.

The previous prime is 1156111403. The next prime is 1156111421. The reversal of 1156111420 is 241116511.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1156111391 and 1156111400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156111421) 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, 28902766 + ... + 28902805.

It is an arithmetic number, because the mean of its divisors is an integer number (202319502).

Almost surely, 2^1156111420 is an apocalyptic number.

1156111420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1156111420 is an abundant number, since it is smaller than the sum of its proper divisors (1271722604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1156111420 is a wasteful number, since it uses less digits than its factorization.

1156111420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57805580 (or 57805578 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 1156111420 is about 34001.6384899316. The cubic root of 1156111420 is about 1049.5421798513.

Adding to 1156111420 its reverse (241116511), we get a palindrome (1397227931).

The spelling of 1156111420 in words is "one billion, one hundred fifty-six million, one hundred eleven thousand, four hundred twenty".