111780257 has 2 divisors, whose sum is σ = 111780258. Its totient is φ = 111780256.

The previous prime is 111780217. The next prime is 111780269. The reversal of 111780257 is 752087111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84070561 + 27709696 = 9169^2 + 5264^2 .

It is an emirp because it is prime and its reverse (752087111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111780257 - 2¹⁶ = 111714721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111780217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55890128 + 55890129.

It is an arithmetic number, because the mean of its divisors is an integer number (55890129).

Almost surely, 2^111780257 is an apocalyptic number.

It is an amenable number.

111780257 is a deficient number, since it is larger than the sum of its proper divisors (1).

111780257 is an equidigital number, since it uses as much as digits as its factorization.

111780257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3920, while the sum is 32.

The square root of 111780257 is about 10572.6182660682. The cubic root of 111780257 is about 481.7130012671.

The spelling of 111780257 in words is "one hundred eleven million, seven hundred eighty thousand, two hundred fifty-seven".