111701521 has 2 divisors, whose sum is σ = 111701522. Its totient is φ = 111701520.

The previous prime is 111701519. The next prime is 111701537. The reversal of 111701521 is 125107111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104837121 + 6864400 = 10239^2 + 2620^2 .

It is an emirp because it is prime and its reverse (125107111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111701521 - 2¹ = 111701519 is a prime.

Together with 111701519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (111701021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55850760 + 55850761.

It is an arithmetic number, because the mean of its divisors is an integer number (55850761).

Almost surely, 2^111701521 is an apocalyptic number.

It is an amenable number.

111701521 is a deficient number, since it is larger than the sum of its proper divisors (1).

111701521 is an equidigital number, since it uses as much as digits as its factorization.

111701521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70, while the sum is 19.

The square root of 111701521 is about 10568.8940291783. The cubic root of 111701521 is about 481.5998713797.

Adding to 111701521 its reverse (125107111), we get a palindrome (236808632).

The spelling of 111701521 in words is "one hundred eleven million, seven hundred one thousand, five hundred twenty-one".