10643551 has 4 divisors (see below), whose sum is σ = 11010600. Its totient is φ = 10276504.

The previous prime is 10643543. The next prime is 10643557. The reversal of 10643551 is 15534601.

10643551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15534601 = 3533 ⋅4397.

It is a cyclic number.

It is not a de Polignac number, because 10643551 - 2³ = 10643543 is a prime.

It is a super-2 number, since 2×10643551² = 226570355779202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10643557) 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, 183481 + ... + 183538.

It is an arithmetic number, because the mean of its divisors is an integer number (2752650).

Almost surely, 2^10643551 is an apocalyptic number.

10643551 is a deficient number, since it is larger than the sum of its proper divisors (367049).

10643551 is an equidigital number, since it uses as much as digits as its factorization.

10643551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367048.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 10643551 is about 3262.4455551013. The cubic root of 10643551 is about 219.9693552357.

The spelling of 10643551 in words is "ten million, six hundred forty-three thousand, five hundred fifty-one".