1068144721 has 4 divisors (see below), whose sum is σ = 1220736832. Its totient is φ = 915552612.

The previous prime is 1068144719. The next prime is 1068144829. The reversal of 1068144721 is 1274418601.

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 1068144721 - 2¹ = 1068144719 is a prime.

It is a super-2 number, since 2×1068144721² = 2281866290000335682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1068544721) 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, 76296045 + ... + 76296058.

It is an arithmetic number, because the mean of its divisors is an integer number (305184208).

Almost surely, 2^1068144721 is an apocalyptic number.

It is an amenable number.

1068144721 is a deficient number, since it is larger than the sum of its proper divisors (152592111).

1068144721 is an equidigital number, since it uses as much as digits as its factorization.

1068144721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152592110.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 1068144721 is about 32682.4833970737. The cubic root of 1068144721 is about 1022.2176282827.

The spelling of 1068144721 in words is "one billion, sixty-eight million, one hundred forty-four thousand, seven hundred twenty-one".