1045642643 has 4 divisors (see below), whose sum is σ = 1045782480. Its totient is φ = 1045502808.

The previous prime is 1045642547. The next prime is 1045642649. The reversal of 1045642643 is 3462465401.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3462465401 = 463 ⋅7478327.

It is a cyclic number.

It is not a de Polignac number, because 1045642643 - 2¹² = 1045638547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1045642649) 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, 58028 + ... + 73881.

It is an arithmetic number, because the mean of its divisors is an integer number (261445620).

Almost surely, 2^1045642643 is an apocalyptic number.

1045642643 is a deficient number, since it is larger than the sum of its proper divisors (139837).

1045642643 is an equidigital number, since it uses as much as digits as its factorization.

1045642643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139836.

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 1045642643 is about 32336.3981141994. The cubic root of 1045642643 is about 1014.9884386398.

The spelling of 1045642643 in words is "one billion, forty-five million, six hundred forty-two thousand, six hundred forty-three".