10521689 has 2 divisors, whose sum is σ = 10521690. Its totient is φ = 10521688.

The previous prime is 10521683. The next prime is 10521697. The reversal of 10521689 is 98612501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5382400 + 5139289 = 2320^2 + 2267^2 .

It is a cyclic number.

It is not a de Polignac number, because 10521689 - 2⁴ = 10521673 is a prime.

It is a super-2 number, since 2×10521689² = 221411878825442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10521683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5260844 + 5260845.

It is an arithmetic number, because the mean of its divisors is an integer number (5260845).

Almost surely, 2^10521689 is an apocalyptic number.

It is an amenable number.

10521689 is a deficient number, since it is larger than the sum of its proper divisors (1).

10521689 is an equidigital number, since it uses as much as digits as its factorization.

10521689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 10521689 is about 3243.7153080996. The cubic root of 10521689 is about 219.1266269356.

The spelling of 10521689 in words is "ten million, five hundred twenty-one thousand, six hundred eighty-nine".