117802781 has 2 divisors, whose sum is σ = 117802782. Its totient is φ = 117802780.

The previous prime is 117802687. The next prime is 117802823. The reversal of 117802781 is 187208711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109537156 + 8265625 = 10466^2 + 2875^2 .

It is a cyclic number.

It is not a de Polignac number, because 117802781 - 2¹⁴ = 117786397 is a prime.

It is a super-2 number, since 2×117802781² = 27754990422667922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117802381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58901390 + 58901391.

It is an arithmetic number, because the mean of its divisors is an integer number (58901391).

Almost surely, 2^117802781 is an apocalyptic number.

It is an amenable number.

117802781 is a deficient number, since it is larger than the sum of its proper divisors (1).

117802781 is an equidigital number, since it uses as much as digits as its factorization.

117802781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6272, while the sum is 35.

The square root of 117802781 is about 10853.6989547343. The cubic root of 117802781 is about 490.2134028118.

The spelling of 117802781 in words is "one hundred seventeen million, eight hundred two thousand, seven hundred eighty-one".