1016553621 has 16 divisors (see below), whose sum is σ = 1384667136. Its totient is φ = 663139776.

The previous prime is 1016553619. The next prime is 1016553653. The reversal of 1016553621 is 1263556101.

1016553621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1016553621 - 2¹ = 1016553619 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1016553661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52551 + ... + 69243.

It is an arithmetic number, because the mean of its divisors is an integer number (86541696).

Almost surely, 2^1016553621 is an apocalyptic number.

It is an amenable number.

1016553621 is a deficient number, since it is larger than the sum of its proper divisors (368113515).

1016553621 is a wasteful number, since it uses less digits than its factorization.

1016553621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17132.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 1016553621 is about 31883.4380360713. The cubic root of 1016553621 is about 1005.4877036877.

The spelling of 1016553621 in words is "one billion, sixteen million, five hundred fifty-three thousand, six hundred twenty-one".