1121161540 has 12 divisors (see below), whose sum is σ = 2354439276. Its totient is φ = 448464608.

The previous prime is 1121161513. The next prime is 1121161541. The reversal of 1121161540 is 451611211.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 377835844 + 743325696 = 19438^2 + 27264^2 .

It is not an unprimeable number, because it can be changed into a prime (1121161541) 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, 28029019 + ... + 28029058.

It is an arithmetic number, because the mean of its divisors is an integer number (196203273).

Almost surely, 2^1121161540 is an apocalyptic number.

1121161540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1121161540 is an abundant number, since it is smaller than the sum of its proper divisors (1233277736).

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

1121161540 is a wasteful number, since it uses less digits than its factorization.

1121161540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56058086 (or 56058084 counting only the distinct ones).

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

The square root of 1121161540 is about 33483.7503873147. The cubic root of 1121161540 is about 1038.8577016681.

Adding to 1121161540 its reverse (451611211), we get a palindrome (1572772751).

The spelling of 1121161540 in words is "one billion, one hundred twenty-one million, one hundred sixty-one thousand, five hundred forty".