11156531201 has 2 divisors, whose sum is σ = 11156531202. Its totient is φ = 11156531200.

The previous prime is 11156531171. The next prime is 11156531219. The reversal of 11156531201 is 10213565111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11151148801 + 5382400 = 105599^2 + 2320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11156531201 is a prime.

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 (11156531801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5578265600 + 5578265601.

It is an arithmetic number, because the mean of its divisors is an integer number (5578265601).

Almost surely, 2^11156531201 is an apocalyptic number.

It is an amenable number.

11156531201 is a deficient number, since it is larger than the sum of its proper divisors (1).

11156531201 is an equidigital number, since it uses as much as digits as its factorization.

11156531201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 26.

The spelling of 11156531201 in words is "eleven billion, one hundred fifty-six million, five hundred thirty-one thousand, two hundred one".