1021643613 has 12 divisors (see below), whose sum is σ = 1476023328. Its totient is φ = 680949960.

The previous prime is 1021643603. The next prime is 1021643627. The reversal of 1021643613 is 3163461201.

1021643613 is a `hidden beast` number, since 1 + 0 + 2 + 1 + 6 + 43 + 613 = 666.

It is not a de Polignac number, because 1021643613 - 2¹³ = 1021635421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021643603) 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 11 ways as a sum of consecutive naturals, for example, 47806 + ... + 65792.

It is an arithmetic number, because the mean of its divisors is an integer number (123001944).

Almost surely, 2^1021643613 is an apocalyptic number.

It is an amenable number.

1021643613 is a deficient number, since it is larger than the sum of its proper divisors (454379715).

1021643613 is a wasteful number, since it uses less digits than its factorization.

1021643613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24304 (or 24301 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 1021643613 is about 31963.1602473848. The cubic root of 1021643613 is about 1007.1631050791.

The spelling of 1021643613 in words is "one billion, twenty-one million, six hundred forty-three thousand, six hundred thirteen".