11235507943981 has 2 divisors, whose sum is σ = 11235507943982. Its totient is φ = 11235507943980.

The previous prime is 11235507943967. The next prime is 11235507943997. The reversal of 11235507943981 is 18934970553211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6564182188356 + 4671325755625 = 2562066^2 + 2161325^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11235507943981 is a prime.

It is a super-2 number, since 2×11235507943981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11235507943181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5617753971990 + 5617753971991.

It is an arithmetic number, because the mean of its divisors is an integer number (5617753971991).

Almost surely, 2^{11235507943981} is an apocalyptic number.

It is an amenable number.

11235507943981 is a deficient number, since it is larger than the sum of its proper divisors (1).

11235507943981 is an equidigital number, since it uses as much as digits as its factorization.

11235507943981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8164800, while the sum is 58.

The spelling of 11235507943981 in words is "eleven trillion, two hundred thirty-five billion, five hundred seven million, nine hundred forty-three thousand, nine hundred eighty-one".