111513515081 has 2 divisors, whose sum is σ = 111513515082. Its totient is φ = 111513515080.

The previous prime is 111513515051. The next prime is 111513515083. The reversal of 111513515081 is 180515315111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110018919481 + 1494595600 = 331691^2 + 38660^2 .

It is a cyclic number.

It is not a de Polignac number, because 111513515081 - 2⁶ = 111513515017 is a prime.

It is a super-2 number, since 2×111513515081² (a number of 23 digits) contains 22 as substring.

Together with 111513515083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111513515083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55756757540 + 55756757541.

It is an arithmetic number, because the mean of its divisors is an integer number (55756757541).

Almost surely, 2^111513515081 is an apocalyptic number.

It is an amenable number.

111513515081 is a deficient number, since it is larger than the sum of its proper divisors (1).

111513515081 is an equidigital number, since it uses as much as digits as its factorization.

111513515081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3000, while the sum is 32.

The spelling of 111513515081 in words is "one hundred eleven billion, five hundred thirteen million, five hundred fifteen thousand, eighty-one".