1012205123 has 2 divisors, whose sum is σ = 1012205124. Its totient is φ = 1012205122.

The previous prime is 1012205101. The next prime is 1012205179. The reversal of 1012205123 is 3215022101.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1012205123 - 2⁶ = 1012205059 is a prime.

It is a super-2 number, since 2×1012205123² = 2049118422054890258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1012235123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506102561 + 506102562.

It is an arithmetic number, because the mean of its divisors is an integer number (506102562).

Almost surely, 2^1012205123 is an apocalyptic number.

1012205123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012205123 is an equidigital number, since it uses as much as digits as its factorization.

1012205123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 1012205123 is about 31815.1712709519. The cubic root of 1012205123 is about 1004.0519339892.

Adding to 1012205123 its reverse (3215022101), we get a palindrome (4227227224).

The spelling of 1012205123 in words is "one billion, twelve million, two hundred five thousand, one hundred twenty-three".