1280211985 has 16 divisors (see below), whose sum is σ = 1675376640. Its totient is φ = 933416640.

The previous prime is 1280211983. The next prime is 1280211997. The reversal of 1280211985 is 5891120821.

It is not a de Polignac number, because 1280211985 - 2¹ = 1280211983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1280211983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119521 + ... + 129790.

It is an arithmetic number, because the mean of its divisors is an integer number (104711040).

Almost surely, 2^1280211985 is an apocalyptic number.

It is an amenable number.

1280211985 is a deficient number, since it is larger than the sum of its proper divisors (395164655).

1280211985 is a wasteful number, since it uses less digits than its factorization.

1280211985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249408.

The product of its (nonzero) digits is 11520, while the sum is 37.

The square root of 1280211985 is about 35780.0500977849. The cubic root of 1280211985 is about 1085.8269824771.

The spelling of 1280211985 in words is "one billion, two hundred eighty million, two hundred eleven thousand, nine hundred eighty-five".