1011199981 has 8 divisors (see below), whose sum is σ = 1114050528. Its totient is φ = 910170000.

The previous prime is 1011199957. The next prime is 1011200011. The reversal of 1011199981 is 1899911101.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011199981 is a prime.

It is a super-2 number, since 2×1011199981² = 2045050803148800722, 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 (1011199901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 453975 + ... + 456196.

It is an arithmetic number, because the mean of its divisors is an integer number (139256316).

Almost surely, 2^1011199981 is an apocalyptic number.

1011199981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1011199981 is a deficient number, since it is larger than the sum of its proper divisors (102850547).

1011199981 is a wasteful number, since it uses less digits than its factorization.

1011199981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910283.

The product of its (nonzero) digits is 5832, while the sum is 40.

The square root of 1011199981 is about 31799.3707642148. The cubic root of 1011199981 is about 1003.7194753508.

It can be divided in two parts, 101 and 1199981, that multiplied together give a square (121198081 = 11009²).

The spelling of 1011199981 in words is "one billion, eleven million, one hundred ninety-nine thousand, nine hundred eighty-one".