15312021229 has 2 divisors, whose sum is σ = 15312021230. Its totient is φ = 15312021228.

The previous prime is 15312021223. The next prime is 15312021247. The reversal of 15312021229 is 92212021351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14249913129 + 1062108100 = 119373^2 + 32590^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15312021229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15312021197 and 15312021206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15312021223) 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, 7656010614 + 7656010615.

It is an arithmetic number, because the mean of its divisors is an integer number (7656010615).

Almost surely, 2^15312021229 is an apocalyptic number.

It is an amenable number.

15312021229 is a deficient number, since it is larger than the sum of its proper divisors (1).

15312021229 is an equidigital number, since it uses as much as digits as its factorization.

15312021229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The spelling of 15312021229 in words is "fifteen billion, three hundred twelve million, twenty-one thousand, two hundred twenty-nine".