1001216553 has 8 divisors (see below), whose sum is σ = 1338918048. Its totient is φ = 665496384.

The previous prime is 1001216551. The next prime is 1001216563. The reversal of 1001216553 is 3556121001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1001216553 - 2¹ = 1001216551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1001216551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 494151 + ... + 496172.

It is an arithmetic number, because the mean of its divisors is an integer number (167364756).

Almost surely, 2^1001216553 is an apocalyptic number.

It is an amenable number.

1001216553 is a deficient number, since it is larger than the sum of its proper divisors (337701495).

1001216553 is an equidigital number, since it uses as much as digits as its factorization.

1001216553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990663.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 1001216553 is about 31642.0061468928. The cubic root of 1001216553 is about 1000.4053533331.

Adding to 1001216553 its reverse (3556121001), we get a palindrome (4557337554).

It can be divided in two parts, 10012 and 16553, that added together give a triangular number (26565 = T₂₃₀).

The spelling of 1001216553 in words is "one billion, one million, two hundred sixteen thousand, five hundred fifty-three".