1061721 has 8 divisors (see below), whose sum is σ = 1572960. Its totient is φ = 707796.

The previous prime is 1061717. The next prime is 1061729. The reversal of 1061721 is 1271601.

It is not a de Polignac number, because 1061721 - 2² = 1061717 is a prime.

It is a super-2 number, since 2×1061721² = 2254502963682, which contains 22 as substring.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1061694 and 1061703.

It is not an unprimeable number, because it can be changed into a prime (1061729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19635 + ... + 19688.

It is an arithmetic number, because the mean of its divisors is an integer number (196620).

2^1061721 is an apocalyptic number.

It is an amenable number.

1061721 is a deficient number, since it is larger than the sum of its proper divisors (511239).

1061721 is an equidigital number, since it uses as much as digits as its factorization.

1061721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39332 (or 39326 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 18.

The square root of 1061721 is about 1030.3984666138. The cubic root of 1061721 is about 102.0164333384.

The spelling of 1061721 in words is "one million, sixty-one thousand, seven hundred twenty-one".