111621701 has 2 divisors, whose sum is σ = 111621702. Its totient is φ = 111621700.

The previous prime is 111621689. The next prime is 111621703. The reversal of 111621701 is 107126111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88830625 + 22791076 = 9425^2 + 4774^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111621701 is a prime.

Together with 111621703, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111621703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55810850 + 55810851.

It is an arithmetic number, because the mean of its divisors is an integer number (55810851).

Almost surely, 2^111621701 is an apocalyptic number.

It is an amenable number.

111621701 is a deficient number, since it is larger than the sum of its proper divisors (1).

111621701 is an equidigital number, since it uses as much as digits as its factorization.

111621701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 20.

The square root of 111621701 is about 10565.1171787160. The cubic root of 111621701 is about 481.4851296957.

Adding to 111621701 its reverse (107126111), we get a palindrome (218747812).

The spelling of 111621701 in words is "one hundred eleven million, six hundred twenty-one thousand, seven hundred one".