1115961980 has 24 divisors (see below), whose sum is σ = 2678309088. Its totient is φ = 382615488.

The previous prime is 1115961971. The next prime is 1115961989. The reversal of 1115961980 is 891695111.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1115961971) and next prime (1115961989).

It is a super-2 number, since 2×1115961980² = 2490742281611040800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1115961989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3985439 + ... + 3985718.

It is an arithmetic number, because the mean of its divisors is an integer number (111596212).

Almost surely, 2^1115961980 is an apocalyptic number.

1115961980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1115961980 is an abundant number, since it is smaller than the sum of its proper divisors (1562347108).

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

1115961980 is a wasteful number, since it uses less digits than its factorization.

1115961980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7971173 (or 7971171 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 41.

The square root of 1115961980 is about 33406.0171226682. The cubic root of 1115961980 is about 1037.2492582233.

The spelling of 1115961980 in words is "one billion, one hundred fifteen million, nine hundred sixty-one thousand, nine hundred eighty".