1001949381 has 12 divisors (see below), whose sum is σ = 1486375852. Its totient is φ = 649912896.

The previous prime is 1001949371. The next prime is 1001949397. The reversal of 1001949381 is 1839491001.

1001949381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 758121156 + 243828225 = 27534^2 + 15615^2 .

It is not a de Polignac number, because 1001949381 - 2⁶ = 1001949317 is a prime.

It is a super-2 number, since 2×1001949381² = 2007805124172566322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001949371) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1504096 + ... + 1504761.

Almost surely, 2^1001949381 is an apocalyptic number.

It is an amenable number.

1001949381 is a deficient number, since it is larger than the sum of its proper divisors (484426471).

1001949381 is a wasteful number, since it uses less digits than its factorization.

1001949381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3008900 (or 3008897 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 1001949381 is about 31653.5840150843. The cubic root of 1001949381 is about 1000.6493718915.

The spelling of 1001949381 in words is "one billion, one million, nine hundred forty-nine thousand, three hundred eighty-one".