1004851981 has 4 divisors (see below), whose sum is σ = 1148402272. Its totient is φ = 861301692.

The previous prime is 1004851979. The next prime is 1004851987. The reversal of 1004851981 is 1891584001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1004851981 - 2¹ = 1004851979 is a prime.

It is a super-2 number, since 2×1004851981² = 2019455007439248722, 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 1004851981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1004851987) 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 3 ways as a sum of consecutive naturals, for example, 71775135 + ... + 71775148.

It is an arithmetic number, because the mean of its divisors is an integer number (287100568).

Almost surely, 2^1004851981 is an apocalyptic number.

It is an amenable number.

1004851981 is a deficient number, since it is larger than the sum of its proper divisors (143550291).

1004851981 is an equidigital number, since it uses as much as digits as its factorization.

1004851981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143550290.

The product of its (nonzero) digits is 11520, while the sum is 37.

The square root of 1004851981 is about 31699.4003255582. The cubic root of 1004851981 is about 1001.6147182815.

The spelling of 1004851981 in words is "one billion, four million, eight hundred fifty-one thousand, nine hundred eighty-one".