1344131721 has 12 divisors (see below), whose sum is σ = 1948909248. Its totient is φ = 892679064.

The previous prime is 1344131717. The next prime is 1344131729. The reversal of 1344131721 is 1271314431.

1344131721 is a `hidden beast` number, since 1 + 344 + 1 + 317 + 2 + 1 = 666.

It is not a de Polignac number, because 1344131721 - 2² = 1344131717 is a prime.

It is a super-3 number, since 3×1344131721³ (a number of 28 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1344131729) 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 11 ways as a sum of consecutive naturals, for example, 281565 + ... + 286298.

It is an arithmetic number, because the mean of its divisors is an integer number (162409104).

Almost surely, 2^1344131721 is an apocalyptic number.

It is an amenable number.

1344131721 is a deficient number, since it is larger than the sum of its proper divisors (604777527).

1344131721 is a wasteful number, since it uses less digits than its factorization.

1344131721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568132 (or 568129 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 1344131721 is about 36662.4020080518. The cubic root of 1344131721 is about 1103.6057217806.

The spelling of 1344131721 in words is "one billion, three hundred forty-four million, one hundred thirty-one thousand, seven hundred twenty-one".