1067611721 has 16 divisors (see below), whose sum is σ = 1192078080. Its totient is φ = 947806080.

The previous prime is 1067611663. The next prime is 1067611739. The reversal of 1067611721 is 1271167601.

It is a cyclic number.

It is not a de Polignac number, because 1067611721 - 2¹⁴ = 1067595337 is a prime.

It is a super-2 number, since 2×1067611721² = 2279589573633163682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1067611021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 261125 + ... + 265181.

It is an arithmetic number, because the mean of its divisors is an integer number (74504880).

Almost surely, 2^1067611721 is an apocalyptic number.

1067611721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1067611721 is a deficient number, since it is larger than the sum of its proper divisors (124466359).

1067611721 is a wasteful number, since it uses less digits than its factorization.

1067611721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4624.

The product of its (nonzero) digits is 3528, while the sum is 32.

The square root of 1067611721 is about 32674.3281644780. The cubic root of 1067611721 is about 1022.0475724731.

The spelling of 1067611721 in words is "one billion, sixty-seven million, six hundred eleven thousand, seven hundred twenty-one".