1127780197 has 2 divisors, whose sum is σ = 1127780198. Its totient is φ = 1127780196.

The previous prime is 1127780177. The next prime is 1127780201. The reversal of 1127780197 is 7910877211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 773173636 + 354606561 = 27806^2 + 18831^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1127780197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1127780177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 563890098 + 563890099.

It is an arithmetic number, because the mean of its divisors is an integer number (563890099).

Almost surely, 2^1127780197 is an apocalyptic number.

It is an amenable number.

1127780197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1127780197 is an equidigital number, since it uses as much as digits as its factorization.

1127780197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49392, while the sum is 43.

The square root of 1127780197 is about 33582.4388185254. The cubic root of 1127780197 is about 1040.8979538197.

It can be divided in two parts, 1127780 and 197, that multiplied together give a triangular number (222172660 = T₂₁₀₇₉).

The spelling of 1127780197 in words is "one billion, one hundred twenty-seven million, seven hundred eighty thousand, one hundred ninety-seven".