1001200253509 has 2 divisors, whose sum is σ = 1001200253510. Its totient is φ = 1001200253508.

The previous prime is 1001200253479. The next prime is 1001200253519. The reversal of 1001200253509 is 9053520021001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 532184840100 + 469015413409 = 729510^2 + 684847^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001200253509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001200253519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500600126754 + 500600126755.

It is an arithmetic number, because the mean of its divisors is an integer number (500600126755).

Almost surely, 2^{1001200253509} is an apocalyptic number.

It is an amenable number.

1001200253509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001200253509 is an equidigital number, since it uses as much as digits as its factorization.

1001200253509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 28.

The spelling of 1001200253509 in words is "one trillion, one billion, two hundred million, two hundred fifty-three thousand, five hundred nine".