1144664261 has 4 divisors (see below), whose sum is σ = 1232715372. Its totient is φ = 1056613152.

The previous prime is 1144664237. The next prime is 1144664293. The reversal of 1144664261 is 1624664411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1624664411 = 2777 ⋅585043.

It can be written as a sum of positive squares in 2 ways, for example, as 106213636 + 1038450625 = 10306^2 + 32225^2 .

It is a cyclic number.

It is not a de Polignac number, because 1144664261 - 2¹⁸ = 1144402117 is a prime.

It is a super-2 number, since 2×1144664261² = 2620512540821352242, 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 (1144664221) 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, 44025536 + ... + 44025561.

It is an arithmetic number, because the mean of its divisors is an integer number (308178843).

Almost surely, 2^1144664261 is an apocalyptic number.

It is an amenable number.

1144664261 is a deficient number, since it is larger than the sum of its proper divisors (88051111).

1144664261 is an equidigital number, since it uses as much as digits as its factorization.

1144664261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88051110.

The product of its digits is 27648, while the sum is 35.

The square root of 1144664261 is about 33832.8872696375. The cubic root of 1144664261 is about 1046.0666934286.

The spelling of 1144664261 in words is "one billion, one hundred forty-four million, six hundred sixty-four thousand, two hundred sixty-one".