1280069149 has 2 divisors, whose sum is σ = 1280069150. Its totient is φ = 1280069148.

The previous prime is 1280069137. The next prime is 1280069177. The reversal of 1280069149 is 9419600821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 974064100 + 306005049 = 31210^2 + 17493^2 .

It is a cyclic number.

It is not a de Polignac number, because 1280069149 - 2¹¹ = 1280067101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1280069249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640034574 + 640034575.

It is an arithmetic number, because the mean of its divisors is an integer number (640034575).

Almost surely, 2^1280069149 is an apocalyptic number.

It is an amenable number.

1280069149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280069149 is an equidigital number, since it uses as much as digits as its factorization.

1280069149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 1280069149 is about 35778.0540135989. The cubic root of 1280069149 is about 1085.7865982925.

The spelling of 1280069149 in words is "one billion, two hundred eighty million, sixty-nine thousand, one hundred forty-nine".