111561142513 has 2 divisors, whose sum is σ = 111561142514. Its totient is φ = 111561142512.

The previous prime is 111561142507. The next prime is 111561142531. The reversal of 111561142513 is 315241165111.

Together with next prime (111561142531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77981679504 + 33579463009 = 279252^2 + 183247^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111561142513 is a prime.

It is not a weakly prime, because it can be changed into another prime (111561142013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55780571256 + 55780571257.

It is an arithmetic number, because the mean of its divisors is an integer number (55780571257).

Almost surely, 2^111561142513 is an apocalyptic number.

It is an amenable number.

111561142513 is a deficient number, since it is larger than the sum of its proper divisors (1).

111561142513 is an equidigital number, since it uses as much as digits as its factorization.

111561142513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 31.

The spelling of 111561142513 in words is "one hundred eleven billion, five hundred sixty-one million, one hundred forty-two thousand, five hundred thirteen".