15231781049 has 2 divisors, whose sum is σ = 15231781050. Its totient is φ = 15231781048.

The previous prime is 15231781031. The next prime is 15231781067. The reversal of 15231781049 is 94018713251.

15231781049 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (15231781031) and next prime (15231781067).

It can be written as a sum of positive squares in only one way, i.e., 8214703225 + 7017077824 = 90635^2 + 83768^2 .

It is a cyclic number.

It is not a de Polignac number, because 15231781049 - 2⁸ = 15231780793 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15231780997 and 15231781015.

It is not a weakly prime, because it can be changed into another prime (15251781049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7615890524 + 7615890525.

It is an arithmetic number, because the mean of its divisors is an integer number (7615890525).

Almost surely, 2^15231781049 is an apocalyptic number.

It is an amenable number.

15231781049 is a deficient number, since it is larger than the sum of its proper divisors (1).

15231781049 is an equidigital number, since it uses as much as digits as its factorization.

15231781049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 41.

The spelling of 15231781049 in words is "fifteen billion, two hundred thirty-one million, seven hundred eighty-one thousand, forty-nine".