1020621793 has 2 divisors, whose sum is σ = 1020621794. Its totient is φ = 1020621792.

The previous prime is 1020621743. The next prime is 1020621799. The reversal of 1020621793 is 3971260201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 728622049 + 291999744 = 26993^2 + 17088^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020621793 - 2⁹ = 1020621281 is a prime.

It is not a weakly prime, because it can be changed into another prime (1020621799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510310896 + 510310897.

It is an arithmetic number, because the mean of its divisors is an integer number (510310897).

Almost surely, 2^1020621793 is an apocalyptic number.

It is an amenable number.

1020621793 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020621793 is an equidigital number, since it uses as much as digits as its factorization.

1020621793 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 1020621793 is about 31947.1719092630. The cubic root of 1020621793 is about 1006.8272140739.

Adding to 1020621793 its reverse (3971260201), we get a palindrome (4991881994).

The spelling of 1020621793 in words is "one billion, twenty million, six hundred twenty-one thousand, seven hundred ninety-three".