100780681 has 2 divisors, whose sum is σ = 100780682. Its totient is φ = 100780680.

The previous prime is 100780651. The next prime is 100780697. The reversal of 100780681 is 186087001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63680400 + 37100281 = 7980^2 + 6091^2 .

It is a cyclic number.

It is not a de Polignac number, because 100780681 - 2⁵ = 100780649 is a prime.

It is a super-2 number, since 2×100780681² = 20313491325647522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (100780651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50390340 + 50390341.

It is an arithmetic number, because the mean of its divisors is an integer number (50390341).

Almost surely, 2^100780681 is an apocalyptic number.

It is an amenable number.

100780681 is a deficient number, since it is larger than the sum of its proper divisors (1).

100780681 is an equidigital number, since it uses as much as digits as its factorization.

100780681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 31.

The square root of 100780681 is about 10038.9581630765. The cubic root of 100780681 is about 465.3636204652.

The spelling of 100780681 in words is "one hundred million, seven hundred eighty thousand, six hundred eighty-one".