1000142981 has 8 divisors (see below), whose sum is σ = 1041579000. Its totient is φ = 959170240.

The previous prime is 1000142959. The next prime is 1000143029. The reversal of 1000142981 is 1892410001.

It can be written as a sum of positive squares in 4 ways, for example, as 281098756 + 719044225 = 16766^2 + 26815^2 .

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-1000142981 is a prime.

It is a super-2 number, since 2×1000142981² = 2000571964887132722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1000142981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000142921) 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, 111410 + ... + 120051.

It is an arithmetic number, because the mean of its divisors is an integer number (130197375).

Almost surely, 2^1000142981 is an apocalyptic number.

It is an amenable number.

1000142981 is a deficient number, since it is larger than the sum of its proper divisors (41436019).

1000142981 is a wasteful number, since it uses less digits than its factorization.

1000142981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231639.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 1000142981 is about 31625.0372489899. The cubic root of 1000142981 is about 1000.0476580620.

Adding to 1000142981 its reverse (1892410001), we get a palindrome (2892552982).

The spelling of 1000142981 in words is "one billion, one hundred forty-two thousand, nine hundred eighty-one".