1002155131999 has 24 divisors (see below), whose sum is σ = 1198159680960. Its totient is φ = 835358561856.

The previous prime is 1002155131937. The next prime is 1002155132039. The reversal of 1002155131999 is 9991315512001.

It is a happy number.

It is not a de Polignac number, because 1002155131999 - 2²³ = 1002146743391 is a prime.

It is a super-2 number, since 2×1002155131999² (a number of 25 digits) 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 (1002155131799) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1024264 + ... + 1747405.

It is an arithmetic number, because the mean of its divisors is an integer number (49923320040).

Almost surely, 2^{1002155131999} is an apocalyptic number.

1002155131999 is a deficient number, since it is larger than the sum of its proper divisors (196004548961).

1002155131999 is a wasteful number, since it uses less digits than its factorization.

1002155131999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2771887 (or 2771880 counting only the distinct ones).

The product of its (nonzero) digits is 109350, while the sum is 46.

The spelling of 1002155131999 in words is "one trillion, two billion, one hundred fifty-five million, one hundred thirty-one thousand, nine hundred ninety-nine".