1021644061 has 16 divisors (see below), whose sum is σ = 1083688704. Its totient is φ = 961196544.

The previous prime is 1021644047. The next prime is 1021644077. The reversal of 1021644061 is 1604461201.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021644061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021644031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 384640 + ... + 387286.

It is an arithmetic number, because the mean of its divisors is an integer number (67730544).

Almost surely, 2^1021644061 is an apocalyptic number.

It is an amenable number.

1021644061 is a deficient number, since it is larger than the sum of its proper divisors (62044643).

1021644061 is a wasteful number, since it uses less digits than its factorization.

1021644061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2940.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1021644061 is about 31963.1672554520. The cubic root of 1021644061 is about 1007.1632522958.

The spelling of 1021644061 in words is "one billion, twenty-one million, six hundred forty-four thousand, sixty-one".