1001138501 has 4 divisors (see below), whose sum is σ = 1092151104. Its totient is φ = 910125900.

The previous prime is 1001138497. The next prime is 1001138531. The reversal of 1001138501 is 1058311001.

1001138501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1001138501 - 2² = 1001138497 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001138531) 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, 45506285 + ... + 45506306.

It is an arithmetic number, because the mean of its divisors is an integer number (273037776).

Almost surely, 2^1001138501 is an apocalyptic number.

1001138501 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1001138501 is a deficient number, since it is larger than the sum of its proper divisors (91012603).

1001138501 is an equidigital number, since it uses as much as digits as its factorization.

1001138501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91012602.

The product of its (nonzero) digits is 120, while the sum is 20.

The square root of 1001138501 is about 31640.7727623710. The cubic root of 1001138501 is about 1000.3793564039.

Adding to 1001138501 its reverse (1058311001), we get a palindrome (2059449502).

The spelling of 1001138501 in words is "one billion, one million, one hundred thirty-eight thousand, five hundred one".