1021123997 has 2 divisors, whose sum is σ = 1021123998. Its totient is φ = 1021123996.

The previous prime is 1021123993. The next prime is 1021124029. The reversal of 1021123997 is 7993211201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 628053721 + 393070276 = 25061^2 + 19826^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021123997 - 2² = 1021123993 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021123993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510561998 + 510561999.

It is an arithmetic number, because the mean of its divisors is an integer number (510561999).

Almost surely, 2^1021123997 is an apocalyptic number.

It is an amenable number.

1021123997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021123997 is an equidigital number, since it uses as much as digits as its factorization.

1021123997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 1021123997 is about 31955.0308558762. The cubic root of 1021123997 is about 1006.9923257561.

The spelling of 1021123997 in words is "one billion, twenty-one million, one hundred twenty-three thousand, nine hundred ninety-seven".