1148581981 has 8 divisors (see below), whose sum is σ = 1215402624. Its totient is φ = 1083168240.

The previous prime is 1148581963. The next prime is 1148582003. The reversal of 1148581981 is 1891858411.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1148581981 - 2⁷ = 1148581853 is a prime.

It is a super-2 number, since 2×1148581981² = 2638481134155768722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1148581481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350046 + ... + 353311.

It is an arithmetic number, because the mean of its divisors is an integer number (151925328).

Almost surely, 2^1148581981 is an apocalyptic number.

It is an amenable number.

1148581981 is a deficient number, since it is larger than the sum of its proper divisors (66820643).

1148581981 is an equidigital number, since it uses as much as digits as its factorization.

1148581981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703451.

The product of its digits is 92160, while the sum is 46.

The square root of 1148581981 is about 33890.7359170615. The cubic root of 1148581981 is about 1047.2587546962.

The spelling of 1148581981 in words is "one billion, one hundred forty-eight million, five hundred eighty-one thousand, nine hundred eighty-one".