1002138541 has 4 divisors (see below), whose sum is σ = 1019124000. Its totient is φ = 985153084.

The previous prime is 1002138539. The next prime is 1002138547. The reversal of 1002138541 is 1458312001.

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: 1458312001 = 34877 ⋅41813.

It is a cyclic number.

It is not a de Polignac number, because 1002138541 - 2¹ = 1002138539 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002138547) 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, 8492641 + ... + 8492758.

It is an arithmetic number, because the mean of its divisors is an integer number (254781000).

Almost surely, 2^1002138541 is an apocalyptic number.

It is an amenable number.

1002138541 is a deficient number, since it is larger than the sum of its proper divisors (16985459).

1002138541 is an equidigital number, since it uses as much as digits as its factorization.

1002138541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16985458.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 1002138541 is about 31656.5718453531. The cubic root of 1002138541 is about 1000.7123394520.

The spelling of 1002138541 in words is "one billion, two million, one hundred thirty-eight thousand, five hundred forty-one".