280468561 has 2 divisors, whose sum is σ = 280468562. Its totient is φ = 280468560.

The previous prime is 280468553. The next prime is 280468571. The reversal of 280468561 is 165864082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 252969025 + 27499536 = 15905^2 + 5244^2 .

It is a cyclic number.

It is not a de Polignac number, because 280468561 - 2³ = 280468553 is a prime.

It is a super-2 number, since 2×280468561² = 157325227418821442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (280468571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140234280 + 140234281.

It is an arithmetic number, because the mean of its divisors is an integer number (140234281).

Almost surely, 2^280468561 is an apocalyptic number.

It is an amenable number.

280468561 is a deficient number, since it is larger than the sum of its proper divisors (1).

280468561 is an equidigital number, since it uses as much as digits as its factorization.

280468561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 280468561 is about 16747.1956159830. The cubic root of 280468561 is about 654.5779858335.

The spelling of 280468561 in words is "two hundred eighty million, four hundred sixty-eight thousand, five hundred sixty-one".