111798521 has 2 divisors, whose sum is σ = 111798522. Its totient is φ = 111798520.

The previous prime is 111798499. The next prime is 111798523. The reversal of 111798521 is 125897111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89567296 + 22231225 = 9464^2 + 4715^2 .

It is a cyclic number.

It is not a de Polignac number, because 111798521 - 2²⁶ = 44689657 is a prime.

Together with 111798523, 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 (111798523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55899260 + 55899261.

It is an arithmetic number, because the mean of its divisors is an integer number (55899261).

Almost surely, 2^111798521 is an apocalyptic number.

It is an amenable number.

111798521 is a deficient number, since it is larger than the sum of its proper divisors (1).

111798521 is an equidigital number, since it uses as much as digits as its factorization.

111798521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 35.

The square root of 111798521 is about 10573.4819714227. The cubic root of 111798521 is about 481.7392358555.

The spelling of 111798521 in words is "one hundred eleven million, seven hundred ninety-eight thousand, five hundred twenty-one".