1031223121 has 2 divisors, whose sum is σ = 1031223122. Its totient is φ = 1031223120.

The previous prime is 1031223113. The next prime is 1031223139. The reversal of 1031223121 is 1213221301.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 668739600 + 362483521 = 25860^2 + 19039^2 .

It is a cyclic number.

It is not a de Polignac number, because 1031223121 - 2³ = 1031223113 is a prime.

It is a super-2 number, since 2×1031223121² = 2126842250569961282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1031223095 and 1031223104.

It is not a weakly prime, because it can be changed into another prime (1031220121) 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, 515611560 + 515611561.

It is an arithmetic number, because the mean of its divisors is an integer number (515611561).

Almost surely, 2^1031223121 is an apocalyptic number.

It is an amenable number.

1031223121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1031223121 is an equidigital number, since it uses as much as digits as its factorization.

1031223121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1031223121 is about 32112.6629384734. The cubic root of 1031223121 is about 1010.3012273427.

Adding to 1031223121 its reverse (1213221301), we get a palindrome (2244444422).

It can be divided in two parts, 10312 and 23121, that added together give a palindrome (33433).

The spelling of 1031223121 in words is "one billion, thirty-one million, two hundred twenty-three thousand, one hundred twenty-one".