1067479509721 has 3 divisors (see below), whose sum is σ = 1067480542911. Its totient is φ = 1067478476532.

The previous prime is 1067479509709. The next prime is 1067479509737. The reversal of 1067479509721 is 1279059747601.

It is a happy number.

The square root of 1067479509721 is 1033189.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 192843061321 + 874636448400 = 439139^2 + 935220^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1067479509721 is a prime.

It is a super-2 number, since 2×1067479509721² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1067479509751) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 516595 + ... + 1549783.

It is an arithmetic number, because the mean of its divisors is an integer number (355826847637).

Almost surely, 2^{1067479509721} is an apocalyptic number.

1067479509721 is the 1033189-th square number.

1067479509721 is the 516595-th centered octagonal number.

It is an amenable number.

1067479509721 is a deficient number, since it is larger than the sum of its proper divisors (1033190).

1067479509721 is an frugal number, since it uses more digits than its factorization.

1067479509721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2066378 (or 1033189 counting only the distinct ones).

The product of its (nonzero) digits is 6667920, while the sum is 58.

The spelling of 1067479509721 in words is "one trillion, sixty-seven billion, four hundred seventy-nine million, five hundred nine thousand, seven hundred twenty-one".