1115872981 has 2 divisors, whose sum is σ = 1115872982. Its totient is φ = 1115872980.

The previous prime is 1115872949. The next prime is 1115873029. The reversal of 1115872981 is 1892785111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 995970481 + 119902500 = 31559^2 + 10950^2 .

It is a cyclic number.

It is not a de Polignac number, because 1115872981 - 2⁵ = 1115872949 is a prime.

It is a super-2 number, since 2×1115872981² = 2490345019451652722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1115872921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 557936490 + 557936491.

It is an arithmetic number, because the mean of its divisors is an integer number (557936491).

Almost surely, 2^1115872981 is an apocalyptic number.

It is an amenable number.

1115872981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1115872981 is an equidigital number, since it uses as much as digits as its factorization.

1115872981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 43.

The square root of 1115872981 is about 33404.6850157280. The cubic root of 1115872981 is about 1037.2216836278.

The spelling of 1115872981 in words is "one billion, one hundred fifteen million, eight hundred seventy-two thousand, nine hundred eighty-one".