1171213549 has 4 divisors (see below), whose sum is σ = 1277687520. Its totient is φ = 1064739580.

The previous prime is 1171213499. The next prime is 1171213553. The reversal of 1171213549 is 9453121711.

It is a happy number.

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 1171213549 - 2⁹ = 1171213037 is a prime.

It is a super-2 number, since 2×1171213549² = 2743482354722350802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1171213559) 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, 53236969 + ... + 53236990.

It is an arithmetic number, because the mean of its divisors is an integer number (319421880).

Almost surely, 2^1171213549 is an apocalyptic number.

It is an amenable number.

1171213549 is a deficient number, since it is larger than the sum of its proper divisors (106473971).

1171213549 is a wasteful number, since it uses less digits than its factorization.

1171213549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106473970.

The product of its digits is 7560, while the sum is 34.

The square root of 1171213549 is about 34222.9973701895. The cubic root of 1171213549 is about 1054.0924336263.

The spelling of 1171213549 in words is "one billion, one hundred seventy-one million, two hundred thirteen thousand, five hundred forty-nine".