1288366091 has 4 divisors (see below), whose sum is σ = 1344382032. Its totient is φ = 1232350152.

The previous prime is 1288366081. The next prime is 1288366109. The reversal of 1288366091 is 1906638821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1906638821 = 11351 ⋅167971.

It is a cyclic number.

It is not a de Polignac number, because 1288366091 - 2²² = 1284171787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1288366031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28007936 + ... + 28007981.

It is an arithmetic number, because the mean of its divisors is an integer number (336095508).

Almost surely, 2^1288366091 is an apocalyptic number.

1288366091 is a deficient number, since it is larger than the sum of its proper divisors (56015941).

1288366091 is an equidigital number, since it uses as much as digits as its factorization.

1288366091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56015940.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 1288366091 is about 35893.8168909354. The cubic root of 1288366091 is about 1088.1274391502.

The spelling of 1288366091 in words is "one billion, two hundred eighty-eight million, three hundred sixty-six thousand, ninety-one".