11521151531 has 2 divisors, whose sum is σ = 11521151532. Its totient is φ = 11521151530.

The previous prime is 11521151483. The next prime is 11521151569. The reversal of 11521151531 is 13515112511.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (13515112511) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11521151531 is a prime.

It is a super-2 number, since 2×11521151531² (a number of 21 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 11521151531.

It is not a weakly prime, because it can be changed into another prime (11521151231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5760575765 + 5760575766.

It is an arithmetic number, because the mean of its divisors is an integer number (5760575766).

Almost surely, 2^11521151531 is an apocalyptic number.

11521151531 is a deficient number, since it is larger than the sum of its proper divisors (1).

11521151531 is an equidigital number, since it uses as much as digits as its factorization.

11521151531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 750, while the sum is 26.

The spelling of 11521151531 in words is "eleven billion, five hundred twenty-one million, one hundred fifty-one thousand, five hundred thirty-one".