111739721 has 2 divisors, whose sum is σ = 111739722. Its totient is φ = 111739720.

The previous prime is 111739709. The next prime is 111739753. The reversal of 111739721 is 127937111.

It is an a-pointer prime, because the next prime (111739753) can be obtained adding 111739721 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105288121 + 6451600 = 10261^2 + 2540^2 .

It is an emirp because it is prime and its reverse (127937111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111739721 - 2¹⁸ = 111477577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111739781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55869860 + 55869861.

It is an arithmetic number, because the mean of its divisors is an integer number (55869861).

Almost surely, 2^111739721 is an apocalyptic number.

It is an amenable number.

111739721 is a deficient number, since it is larger than the sum of its proper divisors (1).

111739721 is an equidigital number, since it uses as much as digits as its factorization.

111739721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2646, while the sum is 32.

The square root of 111739721 is about 10570.7010647355. The cubic root of 111739721 is about 481.6547647484.

The spelling of 111739721 in words is "one hundred eleven million, seven hundred thirty-nine thousand, seven hundred twenty-one".