1171387409 has 4 divisors (see below), whose sum is σ = 1175154240. Its totient is φ = 1167620580.

The previous prime is 1171387391. The next prime is 1171387417. The reversal of 1171387409 is 9047831711.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1171387409 - 2¹² = 1171383313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1171386409) 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, 1882949 + ... + 1883570.

It is an arithmetic number, because the mean of its divisors is an integer number (293788560).

Almost surely, 2^1171387409 is an apocalyptic number.

It is an amenable number.

1171387409 is a deficient number, since it is larger than the sum of its proper divisors (3766831).

1171387409 is an equidigital number, since it uses as much as digits as its factorization.

1171387409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3766830.

The product of its (nonzero) digits is 42336, while the sum is 41.

The square root of 1171387409 is about 34225.5373807337. The cubic root of 1171387409 is about 1054.1445890575.

The spelling of 1171387409 in words is "one billion, one hundred seventy-one million, three hundred eighty-seven thousand, four hundred nine".