1121265156 has 96 divisors (see below), whose sum is σ = 2925812736. Its totient is φ = 331344000.

The previous prime is 1121265149. The next prime is 1121265169. The reversal of 1121265156 is 6515621211.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1054281 + ... + 1055343.

It is an arithmetic number, because the mean of its divisors is an integer number (30477216).

Almost surely, 2^1121265156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1121265156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1462906368).

1121265156 is an abundant number, since it is smaller than the sum of its proper divisors (1804547580).

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

1121265156 is a wasteful number, since it uses less digits than its factorization.

1121265156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1273 (or 1271 counting only the distinct ones).

The product of its digits is 3600, while the sum is 30.

The square root of 1121265156 is about 33485.2976095480. The cubic root of 1121265156 is about 1038.8897038848.

Adding to 1121265156 its reverse (6515621211), we get a palindrome (7636886367).

The spelling of 1121265156 in words is "one billion, one hundred twenty-one million, two hundred sixty-five thousand, one hundred fifty-six".