1020645973 has 2 divisors, whose sum is σ = 1020645974. Its totient is φ = 1020645972.

The previous prime is 1020645947. The next prime is 1020646001. The reversal of 1020645973 is 3795460201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 998433604 + 22212369 = 31598^2 + 4713^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020645973 - 2²¹ = 1018548821 is a prime.

It is a super-2 number, since 2×1020645973² = 2083436404402233458, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020645943) 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, 510322986 + 510322987.

It is an arithmetic number, because the mean of its divisors is an integer number (510322987).

Almost surely, 2^1020645973 is an apocalyptic number.

It is an amenable number.

1020645973 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020645973 is an equidigital number, since it uses as much as digits as its factorization.

1020645973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 1020645973 is about 31947.5503442752. The cubic root of 1020645973 is about 1006.8351650733.

The spelling of 1020645973 in words is "one billion, twenty million, six hundred forty-five thousand, nine hundred seventy-three".