15613543481 has 2 divisors, whose sum is σ = 15613543482. Its totient is φ = 15613543480.

The previous prime is 15613543459. The next prime is 15613543487. The reversal of 15613543481 is 18434531651.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14456455225 + 1157088256 = 120235^2 + 34016^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15613543481 is a prime.

It is a super-3 number, since 3×15613543481³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (15613543487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7806771740 + 7806771741.

It is an arithmetic number, because the mean of its divisors is an integer number (7806771741).

Almost surely, 2^15613543481 is an apocalyptic number.

It is an amenable number.

15613543481 is a deficient number, since it is larger than the sum of its proper divisors (1).

15613543481 is an equidigital number, since it uses as much as digits as its factorization.

15613543481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172800, while the sum is 41.

The spelling of 15613543481 in words is "fifteen billion, six hundred thirteen million, five hundred forty-three thousand, four hundred eighty-one".