280555057 has 2 divisors, whose sum is σ = 280555058. Its totient is φ = 280555056.

The previous prime is 280555049. The next prime is 280555061. The reversal of 280555057 is 750555082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145902241 + 134652816 = 12079^2 + 11604^2 .

It is a cyclic number.

It is not a de Polignac number, because 280555057 - 2³ = 280555049 is a prime.

It is a super-2 number, since 2×280555057² = 157422280016546498, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (286555057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140277528 + 140277529.

It is an arithmetic number, because the mean of its divisors is an integer number (140277529).

Almost surely, 2^280555057 is an apocalyptic number.

It is an amenable number.

280555057 is a deficient number, since it is larger than the sum of its proper divisors (1).

280555057 is an equidigital number, since it uses as much as digits as its factorization.

280555057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70000, while the sum is 37.

The square root of 280555057 is about 16749.7778194220. Note that the first 3 decimals coincide. The cubic root of 280555057 is about 654.6452691419.

The spelling of 280555057 in words is "two hundred eighty million, five hundred fifty-five thousand, fifty-seven".