111779401 has 2 divisors, whose sum is σ = 111779402. Its totient is φ = 111779400.

The previous prime is 111779399. The next prime is 111779443. The reversal of 111779401 is 104977111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68890000 + 42889401 = 8300^2 + 6549^2 .

It is a cyclic number.

It is not a de Polignac number, because 111779401 - 2¹ = 111779399 is a prime.

Together with 111779399, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (111779201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55889700 + 55889701.

It is an arithmetic number, because the mean of its divisors is an integer number (55889701).

Almost surely, 2^111779401 is an apocalyptic number.

It is an amenable number.

111779401 is a deficient number, since it is larger than the sum of its proper divisors (1).

111779401 is an equidigital number, since it uses as much as digits as its factorization.

111779401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1764, while the sum is 31.

The square root of 111779401 is about 10572.5777840600. The cubic root of 111779401 is about 481.7117716302.

The spelling of 111779401 in words is "one hundred eleven million, seven hundred seventy-nine thousand, four hundred one".