1001038381 has 4 divisors (see below), whose sum is σ = 1144043872. Its totient is φ = 858032892.

The previous prime is 1001038331. The next prime is 1001038397. The reversal of 1001038381 is 1838301001.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1838301001 = 17 ⋅108135353.

It is a cyclic number.

It is not a de Polignac number, because 1001038381 - 2¹⁷ = 1000907309 is a prime.

It is a super-2 number, since 2×1001038381² = 2004155680470202322, 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 (1001038331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71502735 + ... + 71502748.

It is an arithmetic number, because the mean of its divisors is an integer number (286010968).

Almost surely, 2^1001038381 is an apocalyptic number.

It is an amenable number.

1001038381 is a deficient number, since it is larger than the sum of its proper divisors (143005491).

1001038381 is an equidigital number, since it uses as much as digits as its factorization.

1001038381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143005490.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 1001038381 is about 31639.1905869919. The cubic root of 1001038381 is about 1000.3460072652.

Adding to 1001038381 its reverse (1838301001), we get a palindrome (2839339382).

The spelling of 1001038381 in words is "one billion, one million, thirty-eight thousand, three hundred eighty-one".