1280225657 has 2 divisors, whose sum is σ = 1280225658. Its totient is φ = 1280225656.

The previous prime is 1280225651. The next prime is 1280225689. The reversal of 1280225657 is 7565220821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1053391936 + 226833721 = 32456^2 + 15061^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1280225657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1280225657.

It is not a weakly prime, because it can be changed into another prime (1280225651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640112828 + 640112829.

It is an arithmetic number, because the mean of its divisors is an integer number (640112829).

Almost surely, 2^1280225657 is an apocalyptic number.

It is an amenable number.

1280225657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280225657 is an equidigital number, since it uses as much as digits as its factorization.

1280225657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 67200, while the sum is 38.

The square root of 1280225657 is about 35780.2411534635. The cubic root of 1280225657 is about 1085.8308478197.

The spelling of 1280225657 in words is "one billion, two hundred eighty million, two hundred twenty-five thousand, six hundred fifty-seven".