1147213261 has 8 divisors (see below), whose sum is σ = 1219740984. Its totient is φ = 1075246080.

The previous prime is 1147213259. The next prime is 1147213267. The reversal of 1147213261 is 1623127411.

It can be written as a sum of positive squares in 4 ways, for example, as 389312361 + 757900900 = 19731^2 + 27530^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1147213261 - 2¹ = 1147213259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1147213267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135910 + ... + 144103.

It is an arithmetic number, because the mean of its divisors is an integer number (152467623).

Almost surely, 2^1147213261 is an apocalyptic number.

It is an amenable number.

1147213261 is a deficient number, since it is larger than the sum of its proper divisors (72527723).

1147213261 is a wasteful number, since it uses less digits than its factorization.

1147213261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280271.

The product of its digits is 2016, while the sum is 28.

The square root of 1147213261 is about 33870.5367687021. The cubic root of 1147213261 is about 1046.8425969815.

The spelling of 1147213261 in words is "one billion, one hundred forty-seven million, two hundred thirteen thousand, two hundred sixty-one".