1021605953 has 2 divisors, whose sum is σ = 1021605954. Its totient is φ = 1021605952.

The previous prime is 1021605943. The next prime is 1021606031. The reversal of 1021605953 is 3595061201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 967023409 + 54582544 = 31097^2 + 7388^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021605953 - 2¹⁰ = 1021604929 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021605913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510802976 + 510802977.

It is an arithmetic number, because the mean of its divisors is an integer number (510802977).

Almost surely, 2^1021605953 is an apocalyptic number.

It is an amenable number.

1021605953 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021605953 is an equidigital number, since it uses as much as digits as its factorization.

1021605953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 1021605953 is about 31962.5711262408. The cubic root of 1021605953 is about 1007.1507295214.

The spelling of 1021605953 in words is "one billion, twenty-one million, six hundred five thousand, nine hundred fifty-three".