1231221037 has 2 divisors, whose sum is σ = 1231221038. Its totient is φ = 1231221036.

The previous prime is 1231221029. The next prime is 1231221049. The reversal of 1231221037 is 7301221321.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1019780356 + 211440681 = 31934^2 + 14541^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231221037 - 2³ = 1231221029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231220999 and 1231221017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231221077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615610518 + 615610519.

It is an arithmetic number, because the mean of its divisors is an integer number (615610519).

Almost surely, 2^1231221037 is an apocalyptic number.

It is an amenable number.

1231221037 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231221037 is an equidigital number, since it uses as much as digits as its factorization.

1231221037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 1231221037 is about 35088.7594109567. The cubic root of 1231221037 is about 1071.7956969971.

Adding to 1231221037 its reverse (7301221321), we get a palindrome (8532442358).

The spelling of 1231221037 in words is "one billion, two hundred thirty-one million, two hundred twenty-one thousand, thirty-seven".