280431101 has 2 divisors, whose sum is σ = 280431102. Its totient is φ = 280431100.

The previous prime is 280431077. The next prime is 280431143. The reversal of 280431101 is 101134082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 182223001 + 98208100 = 13499^2 + 9910^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280431101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280431401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140215550 + 140215551.

It is an arithmetic number, because the mean of its divisors is an integer number (140215551).

Almost surely, 2^280431101 is an apocalyptic number.

It is an amenable number.

280431101 is a deficient number, since it is larger than the sum of its proper divisors (1).

280431101 is an equidigital number, since it uses as much as digits as its factorization.

280431101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 280431101 is about 16746.0771824329. The cubic root of 280431101 is about 654.5488422425.

Adding to 280431101 its reverse (101134082), we get a palindrome (381565183).

The spelling of 280431101 in words is "two hundred eighty million, four hundred thirty-one thousand, one hundred one".