15531242273 has 2 divisors, whose sum is σ = 15531242274. Its totient is φ = 15531242272.

The previous prime is 15531242201. The next prime is 15531242281. The reversal of 15531242273 is 37224213551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15478345744 + 52896529 = 124412^2 + 7273^2 .

It is a cyclic number.

It is not a de Polignac number, because 15531242273 - 2¹⁶ = 15531176737 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (15531242473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7765621136 + 7765621137.

It is an arithmetic number, because the mean of its divisors is an integer number (7765621137).

Almost surely, 2^15531242273 is an apocalyptic number.

It is an amenable number.

15531242273 is a deficient number, since it is larger than the sum of its proper divisors (1).

15531242273 is an equidigital number, since it uses as much as digits as its factorization.

15531242273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 35.

The spelling of 15531242273 in words is "fifteen billion, five hundred thirty-one million, two hundred forty-two thousand, two hundred seventy-three".