2636431321 has 2 divisors, whose sum is σ = 2636431322. Its totient is φ = 2636431320.

The previous prime is 2636431313. The next prime is 2636431333. The reversal of 2636431321 is 1231346362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2264712921 + 371718400 = 47589^2 + 19280^2 .

It is a cyclic number.

It is not a de Polignac number, because 2636431321 - 2³ = 2636431313 is a prime.

It is a super-2 number, since 2×2636431321² = 13901540220699610082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2636441321) 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, 1318215660 + 1318215661.

It is an arithmetic number, because the mean of its divisors is an integer number (1318215661).

Almost surely, 2^2636431321 is an apocalyptic number.

It is an amenable number.

2636431321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2636431321 is an equidigital number, since it uses as much as digits as its factorization.

2636431321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 31.

The square root of 2636431321 is about 51346.1909103295. The cubic root of 2636431321 is about 1381.4616105813.

Adding to 2636431321 its reverse (1231346362), we get a palindrome (3867777683).

The spelling of 2636431321 in words is "two billion, six hundred thirty-six million, four hundred thirty-one thousand, three hundred twenty-one".