161501517 has 12 divisors (see below), whose sum is σ = 236233920. Its totient is φ = 106304328.

The previous prime is 161501503. The next prime is 161501531. The reversal of 161501517 is 715105161.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (161501503) and next prime (161501531).

It is not a de Polignac number, because 161501517 - 2⁶ = 161501453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161501567) 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 in 11 ways as a sum of consecutive naturals, for example, 112863 + ... + 114284.

It is an arithmetic number, because the mean of its divisors is an integer number (19686160).

Almost surely, 2^161501517 is an apocalyptic number.

It is an amenable number.

161501517 is a deficient number, since it is larger than the sum of its proper divisors (74732403).

161501517 is a wasteful number, since it uses less digits than its factorization.

161501517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227232 (or 227229 counting only the distinct ones).

The product of its (nonzero) digits is 1050, while the sum is 27.

The square root of 161501517 is about 12708.3247125654. The cubic root of 161501517 is about 544.5764652660.

Adding to 161501517 its reverse (715105161), we get a palindrome (876606678).

The spelling of 161501517 in words is "one hundred sixty-one million, five hundred one thousand, five hundred seventeen".