1021023109 has 2 divisors, whose sum is σ = 1021023110. Its totient is φ = 1021023108.

The previous prime is 1021023079. The next prime is 1021023119. The reversal of 1021023109 is 9013201201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1020994209 + 28900 = 31953^2 + 170^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021023109 - 2¹⁹ = 1020498821 is a prime.

It is a super-2 number, since 2×1021023109² = 2084976378224051762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021023119) 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, 510511554 + 510511555.

It is an arithmetic number, because the mean of its divisors is an integer number (510511555).

Almost surely, 2^1021023109 is an apocalyptic number.

It is an amenable number.

1021023109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021023109 is an equidigital number, since it uses as much as digits as its factorization.

1021023109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 1021023109 is about 31953.4522235079. The cubic root of 1021023109 is about 1006.9591607380.

The spelling of 1021023109 in words is "one billion, twenty-one million, twenty-three thousand, one hundred nine".