280100861 has 2 divisors, whose sum is σ = 280100862. Its totient is φ = 280100860.

The previous prime is 280100827. The next prime is 280100867. The reversal of 280100861 is 168001082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147136900 + 132963961 = 12130^2 + 11531^2 .

It is a cyclic number.

It is not a de Polignac number, because 280100861 - 2⁶ = 280100797 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 280100861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280100867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140050430 + 140050431.

It is an arithmetic number, because the mean of its divisors is an integer number (140050431).

Almost surely, 2^280100861 is an apocalyptic number.

It is an amenable number.

280100861 is a deficient number, since it is larger than the sum of its proper divisors (1).

280100861 is an equidigital number, since it uses as much as digits as its factorization.

280100861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 280100861 is about 16736.2140581435. The cubic root of 280100861 is about 654.2918057073.

The spelling of 280100861 in words is "two hundred eighty million, one hundred thousand, eight hundred sixty-one".