975821653 has 2 divisors, whose sum is σ = 975821654. Its totient is φ = 975821652.

The previous prime is 975821647. The next prime is 975821663. The reversal of 975821653 is 356128579.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 909203409 + 66618244 = 30153^2 + 8162^2 .

It is an emirp because it is prime and its reverse (356128579) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 975821653 - 2²¹ = 973724501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (975821663) 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 as a sum of consecutive naturals, namely, 487910826 + 487910827.

It is an arithmetic number, because the mean of its divisors is an integer number (487910827).

Almost surely, 2^975821653 is an apocalyptic number.

It is an amenable number.

975821653 is a deficient number, since it is larger than the sum of its proper divisors (1).

975821653 is an equidigital number, since it uses as much as digits as its factorization.

975821653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 453600, while the sum is 46.

The square root of 975821653 is about 31238.1441990397. The cubic root of 975821653 is about 991.8747094652.

It can be divided in two parts, 97582 and 1653, that added together give a triangular number (99235 = T₄₄₅).

The spelling of 975821653 in words is "nine hundred seventy-five million, eight hundred twenty-one thousand, six hundred fifty-three".