1021552249 has 4 divisors (see below), whose sum is σ = 1031470336. Its totient is φ = 1011634164.

The previous prime is 1021552229. The next prime is 1021552267. The reversal of 1021552249 is 9422551201.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9422551201 = 7 ⋅1346078743.

It is a cyclic number.

It is not a de Polignac number, because 1021552249 - 2⁷ = 1021552121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021552249.

It is not an unprimeable number, because it can be changed into a prime (1021552229) 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, 4958889 + ... + 4959094.

It is an arithmetic number, because the mean of its divisors is an integer number (257867584).

Almost surely, 2^1021552249 is an apocalyptic number.

It is an amenable number.

1021552249 is a deficient number, since it is larger than the sum of its proper divisors (9918087).

1021552249 is an equidigital number, since it uses as much as digits as its factorization.

1021552249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9918086.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 1021552249 is about 31961.7310075659. The cubic root of 1021552249 is about 1007.1330811739.

The spelling of 1021552249 in words is "one billion, twenty-one million, five hundred fifty-two thousand, two hundred forty-nine".