11550205531 has 2 divisors, whose sum is σ = 11550205532. Its totient is φ = 11550205530.

The previous prime is 11550205519. The next prime is 11550205547. The reversal of 11550205531 is 13550205511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11550205531 - 2³¹ = 9402721883 is a prime.

It is a super-2 number, since 2×11550205531² (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 11550205531.

It is not a weakly prime, because it can be changed into another prime (11550205631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5775102765 + 5775102766.

It is an arithmetic number, because the mean of its divisors is an integer number (5775102766).

Almost surely, 2^11550205531 is an apocalyptic number.

11550205531 is a deficient number, since it is larger than the sum of its proper divisors (1).

11550205531 is an equidigital number, since it uses as much as digits as its factorization.

11550205531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3750, while the sum is 28.

The spelling of 11550205531 in words is "eleven billion, five hundred fifty million, two hundred five thousand, five hundred thirty-one".