1601542643 has 2 divisors, whose sum is σ = 1601542644. Its totient is φ = 1601542642.

The previous prime is 1601542637. The next prime is 1601542651. The reversal of 1601542643 is 3462451061.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1601542643 - 2⁴ = 1601542627 is a prime.

It is not a weakly prime, because it can be changed into another prime (1601542543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800771321 + 800771322.

It is an arithmetic number, because the mean of its divisors is an integer number (800771322).

Almost surely, 2^1601542643 is an apocalyptic number.

1601542643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601542643 is an equidigital number, since it uses as much as digits as its factorization.

1601542643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 1601542643 is about 40019.2783917951. The cubic root of 1601542643 is about 1169.9828675018.

The spelling of 1601542643 in words is "one billion, six hundred one million, five hundred forty-two thousand, six hundred forty-three".