161227513 has 2 divisors, whose sum is σ = 161227514. Its totient is φ = 161227512.

The previous prime is 161227499. The next prime is 161227543. The reversal of 161227513 is 315722161.

It is a happy number.

161227513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143688169 + 17539344 = 11987^2 + 4188^2 .

It is a cyclic number.

It is not a de Polignac number, because 161227513 - 2⁵ = 161227481 is a prime.

It is a super-3 number, since 3×161227513³ (a number of 26 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (161227543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80613756 + 80613757.

It is an arithmetic number, because the mean of its divisors is an integer number (80613757).

Almost surely, 2^161227513 is an apocalyptic number.

It is an amenable number.

161227513 is a deficient number, since it is larger than the sum of its proper divisors (1).

161227513 is an equidigital number, since it uses as much as digits as its factorization.

161227513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 28.

The square root of 161227513 is about 12697.5396435687. The cubic root of 161227513 is about 544.2683141951.

Adding to 161227513 its reverse (315722161), we get a palindrome (476949674).

It can be divided in two parts, 1612275 and 13, that multiplied together give a triangular number (20959575 = T₆₄₇₄).

The spelling of 161227513 in words is "one hundred sixty-one million, two hundred twenty-seven thousand, five hundred thirteen".