1191456913 has 6 divisors (see below), whose sum is σ = 1209509826. Its totient is φ = 1173669552.

The previous prime is 1191456911. The next prime is 1191456919. The reversal of 1191456913 is 3196541911.

It can be written as a sum of positive squares in only one way, i.e., 1082212609 + 109244304 = 32897^2 + 10452^2 .

It is not a de Polignac number, because 1191456913 - 2¹ = 1191456911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1191456911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 128220 + ... + 137197.

It is an arithmetic number, because the mean of its divisors is an integer number (201584971).

Almost surely, 2^1191456913 is an apocalyptic number.

It is an amenable number.

1191456913 is a deficient number, since it is larger than the sum of its proper divisors (18052913).

1191456913 is an frugal number, since it uses more digits than its factorization.

1191456913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265551 (or 265484 counting only the distinct ones).

The product of its digits is 29160, while the sum is 40.

The square root of 1191456913 is about 34517.4870609087. The cubic root of 1191456913 is about 1060.1307875290.

The spelling of 1191456913 in words is "one billion, one hundred ninety-one million, four hundred fifty-six thousand, nine hundred thirteen".