15538237049 has 2 divisors, whose sum is σ = 15538237050. Its totient is φ = 15538237048.

The previous prime is 15538237019. The next prime is 15538237081. The reversal of 15538237049 is 94073283551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15368065024 + 170172025 = 123968^2 + 13045^2 .

It is a cyclic number.

It is not a de Polignac number, because 15538237049 - 2²⁰ = 15537188473 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15538236994 and 15538237012.

It is not a weakly prime, because it can be changed into another prime (15538237009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7769118524 + 7769118525.

It is an arithmetic number, because the mean of its divisors is an integer number (7769118525).

Almost surely, 2^15538237049 is an apocalyptic number.

It is an amenable number.

15538237049 is a deficient number, since it is larger than the sum of its proper divisors (1).

15538237049 is an equidigital number, since it uses as much as digits as its factorization.

15538237049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 907200, while the sum is 47.

The spelling of 15538237049 in words is "fifteen billion, five hundred thirty-eight million, two hundred thirty-seven thousand, forty-nine".