15319045561 has 2 divisors, whose sum is σ = 15319045562. Its totient is φ = 15319045560.

The previous prime is 15319045541. The next prime is 15319045571. The reversal of 15319045561 is 16554091351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13128805561 + 2190240000 = 114581^2 + 46800^2 .

It is a cyclic number.

It is not a de Polignac number, because 15319045561 - 2³¹ = 13171561913 is a prime.

It is not a weakly prime, because it can be changed into another prime (15319045531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7659522780 + 7659522781.

It is an arithmetic number, because the mean of its divisors is an integer number (7659522781).

Almost surely, 2^15319045561 is an apocalyptic number.

It is an amenable number.

15319045561 is a deficient number, since it is larger than the sum of its proper divisors (1).

15319045561 is an equidigital number, since it uses as much as digits as its factorization.

15319045561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81000, while the sum is 40.

The spelling of 15319045561 in words is "fifteen billion, three hundred nineteen million, forty-five thousand, five hundred sixty-one".