116662781 has 2 divisors, whose sum is σ = 116662782. Its totient is φ = 116662780.

The previous prime is 116662771. The next prime is 116662787. The reversal of 116662781 is 187266611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87123556 + 29539225 = 9334^2 + 5435^2 .

It is a cyclic number.

It is not a de Polignac number, because 116662781 - 2¹⁰ = 116661757 is a prime.

It is a super-2 number, since 2×116662781² = 27220408941307922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (116662787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58331390 + 58331391.

It is an arithmetic number, because the mean of its divisors is an integer number (58331391).

Almost surely, 2^116662781 is an apocalyptic number.

It is an amenable number.

116662781 is a deficient number, since it is larger than the sum of its proper divisors (1).

116662781 is an equidigital number, since it uses as much as digits as its factorization.

116662781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 38.

The square root of 116662781 is about 10801.0546244337. The cubic root of 116662781 is about 488.6269781488.

The spelling of 116662781 in words is "one hundred sixteen million, six hundred sixty-two thousand, seven hundred eighty-one".