1288622091 has 16 divisors (see below), whose sum is σ = 1732496000. Its totient is φ = 851938560.

The previous prime is 1288622033. The next prime is 1288622129. The reversal of 1288622091 is 1902268821.

It is not a de Polignac number, because 1288622091 - 2¹⁰ = 1288621067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1288622191) 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, 241371 + ... + 246651.

It is an arithmetic number, because the mean of its divisors is an integer number (108281000).

Almost surely, 2^1288622091 is an apocalyptic number.

1288622091 is a deficient number, since it is larger than the sum of its proper divisors (443873909).

1288622091 is a wasteful number, since it uses less digits than its factorization.

1288622091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5946.

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 1288622091 is about 35897.3827876072. The cubic root of 1288622091 is about 1088.1995051513.

The spelling of 1288622091 in words is "one billion, two hundred eighty-eight million, six hundred twenty-two thousand, ninety-one".