1021552245 has 72 divisors (see below), whose sum is σ = 2149445376. Its totient is φ = 446668992.

The previous prime is 1021552229. The next prime is 1021552267. The reversal of 1021552245 is 5422551201.

1021552245 is a `hidden beast` number, since 102 + 1 + 552 + 2 + 4 + 5 = 666.

It is not a de Polignac number, because 1021552245 - 2⁴ = 1021552229 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 40644 + ... + 60786.

It is an arithmetic number, because the mean of its divisors is an integer number (29853408).

Almost surely, 2^1021552245 is an apocalyptic number.

1021552245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1021552245 is an abundant number, since it is smaller than the sum of its proper divisors (1127893131).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1021552245 is a wasteful number, since it uses less digits than its factorization.

1021552245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20191 (or 20181 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 1021552245 is about 31961.7309449911. The cubic root of 1021552245 is about 1007.1330798594.

The spelling of 1021552245 in words is "one billion, twenty-one million, five hundred fifty-two thousand, two hundred forty-five".