1280233957 has 2 divisors, whose sum is σ = 1280233958. Its totient is φ = 1280233956.

The previous prime is 1280233831. The next prime is 1280233963. The reversal of 1280233957 is 7593320821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1236858561 + 43375396 = 35169^2 + 6586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1280233957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1280233057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640116978 + 640116979.

It is an arithmetic number, because the mean of its divisors is an integer number (640116979).

Almost surely, 2^1280233957 is an apocalyptic number.

It is an amenable number.

1280233957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280233957 is an equidigital number, since it uses as much as digits as its factorization.

1280233957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 1280233957 is about 35780.3571390784. The cubic root of 1280233957 is about 1085.8331943791.

The spelling of 1280233957 in words is "one billion, two hundred eighty million, two hundred thirty-three thousand, nine hundred fifty-seven".