1021552553 has 4 divisors (see below), whose sum is σ = 1167488640. Its totient is φ = 875616468.

The previous prime is 1021552531. The next prime is 1021552589. The reversal of 1021552553 is 3552551201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1021552553 - 2¹⁸ = 1021290409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1021552513) 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, 72968033 + ... + 72968046.

It is an arithmetic number, because the mean of its divisors is an integer number (291872160).

Almost surely, 2^1021552553 is an apocalyptic number.

It is an amenable number.

1021552553 is a deficient number, since it is larger than the sum of its proper divisors (145936087).

1021552553 is an equidigital number, since it uses as much as digits as its factorization.

1021552553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145936086.

The product of its (nonzero) digits is 7500, while the sum is 29.

The square root of 1021552553 is about 31961.7357632529. The cubic root of 1021552553 is about 1007.1331810769.

The spelling of 1021552553 in words is "one billion, twenty-one million, five hundred fifty-two thousand, five hundred fifty-three".