10649809 has 4 divisors (see below), whose sum is σ = 10658160. Its totient is φ = 10641460.

The previous prime is 10649801. The next prime is 10649827. The reversal of 10649809 is 90894601.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 10649809 - 2³ = 10649801 is a prime.

It is a super-2 number, since 2×10649809² = 226836863472962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10649801) 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, 1819 + ... + 4960.

It is an arithmetic number, because the mean of its divisors is an integer number (2664540).

Almost surely, 2^10649809 is an apocalyptic number.

It is an amenable number.

10649809 is a deficient number, since it is larger than the sum of its proper divisors (8351).

10649809 is an equidigital number, since it uses as much as digits as its factorization.

10649809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8350.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 10649809 is about 3263.4045106300. The cubic root of 10649809 is about 220.0124579722.

The spelling of 10649809 in words is "ten million, six hundred forty-nine thousand, eight hundred nine".