161515603 has 2 divisors, whose sum is σ = 161515604. Its totient is φ = 161515602.

The previous prime is 161515597. The next prime is 161515609. The reversal of 161515603 is 306515161.

It is a balanced prime because it is at equal distance from previous prime (161515597) and next prime (161515609).

It is an emirp because it is prime and its reverse (306515161) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161515603 is a prime.

It is not a weakly prime, because it can be changed into another prime (161515609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80757801 + 80757802.

It is an arithmetic number, because the mean of its divisors is an integer number (80757802).

Almost surely, 2^161515603 is an apocalyptic number.

161515603 is a deficient number, since it is larger than the sum of its proper divisors (1).

161515603 is an equidigital number, since it uses as much as digits as its factorization.

161515603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 161515603 is about 12708.8789041363. The cubic root of 161515603 is about 544.5922972764.

The spelling of 161515603 in words is "one hundred sixty-one million, five hundred fifteen thousand, six hundred three".