1521336129949 has 2 divisors, whose sum is σ = 1521336129950. Its totient is φ = 1521336129948.

The previous prime is 1521336129919. The next prime is 1521336129983. The reversal of 1521336129949 is 9499216331251.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1481368923225 + 39967206724 = 1217115^2 + 199918^2 .

It is an emirp because it is prime and its reverse (9499216331251) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1521336129949 - 2¹³ = 1521336121757 is a prime.

It is a super-2 number, since 2×1521336129949² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1521336129949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1521336129919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 760668064974 + 760668064975.

It is an arithmetic number, because the mean of its divisors is an integer number (760668064975).

Almost surely, 2^{1521336129949} is an apocalyptic number.

It is an amenable number.

1521336129949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1521336129949 is an equidigital number, since it uses as much as digits as its factorization.

1521336129949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3149280, while the sum is 55.

The spelling of 1521336129949 in words is "one trillion, five hundred twenty-one billion, three hundred thirty-six million, one hundred twenty-nine thousand, nine hundred forty-nine".