161515061 has 2 divisors, whose sum is σ = 161515062. Its totient is φ = 161515060.

The previous prime is 161514973. The next prime is 161515063. The reversal of 161515061 is 160515161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84180625 + 77334436 = 9175^2 + 8794^2 .

It is an emirp because it is prime and its reverse (160515161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161515061 - 2¹⁴ = 161498677 is a prime.

It is a super-2 number, since 2×161515061² = 52174229859667442, which contains 22 as substring.

Together with 161515063, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161515061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161515063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80757530 + 80757531.

It is an arithmetic number, because the mean of its divisors is an integer number (80757531).

Almost surely, 2^161515061 is an apocalyptic number.

It is an amenable number.

161515061 is a deficient number, since it is larger than the sum of its proper divisors (1).

161515061 is an equidigital number, since it uses as much as digits as its factorization.

161515061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 161515061 is about 12708.8575804436. The cubic root of 161515061 is about 544.5916881106.

It can be divided in two parts, 16151 and 5061, that added together give a palindrome (21212).

The spelling of 161515061 in words is "one hundred sixty-one million, five hundred fifteen thousand, sixty-one".