2578785281 has 2 divisors, whose sum is σ = 2578785282. Its totient is φ = 2578785280.

The previous prime is 2578785271. The next prime is 2578785359. The reversal of 2578785281 is 1825878752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1901744881 + 677040400 = 43609^2 + 26020^2 .

It is a cyclic number.

It is not a de Polignac number, because 2578785281 - 2⁶ = 2578785217 is a prime.

It is a super-2 number, since 2×2578785281² = 13300267051004497922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2578785211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1289392640 + 1289392641.

It is an arithmetic number, because the mean of its divisors is an integer number (1289392641).

Almost surely, 2^2578785281 is an apocalyptic number.

It is an amenable number.

2578785281 is a deficient number, since it is larger than the sum of its proper divisors (1).

2578785281 is an equidigital number, since it uses as much as digits as its factorization.

2578785281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2508800, while the sum is 53.

The square root of 2578785281 is about 50781.7416105434. The cubic root of 2578785281 is about 1371.3186871403.

The spelling of 2578785281 in words is "two billion, five hundred seventy-eight million, seven hundred eighty-five thousand, two hundred eighty-one".