11051551481 has 2 divisors, whose sum is σ = 11051551482. Its totient is φ = 11051551480.

The previous prime is 11051551409. The next prime is 11051551493. The reversal of 11051551481 is 18415515011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9749785081 + 1301766400 = 98741^2 + 36080^2 .

It is a cyclic number.

It is not a de Polignac number, because 11051551481 - 2¹⁰ = 11051550457 is a prime.

It is a super-2 number, since 2×11051551481² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (11051550481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5525775740 + 5525775741.

It is an arithmetic number, because the mean of its divisors is an integer number (5525775741).

Almost surely, 2^11051551481 is an apocalyptic number.

It is an amenable number.

11051551481 is a deficient number, since it is larger than the sum of its proper divisors (1).

11051551481 is an equidigital number, since it uses as much as digits as its factorization.

11051551481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4000, while the sum is 32.

The spelling of 11051551481 in words is "eleven billion, fifty-one million, five hundred fifty-one thousand, four hundred eighty-one".