161715487 has 4 divisors (see below), whose sum is σ = 161770176. Its totient is φ = 161660800.

The previous prime is 161715473. The next prime is 161715497. The reversal of 161715487 is 784517161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161715487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161715427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22639 + ... + 28912.

It is an arithmetic number, because the mean of its divisors is an integer number (40442544).

Almost surely, 2^161715487 is an apocalyptic number.

161715487 is a deficient number, since it is larger than the sum of its proper divisors (54689).

161715487 is an equidigital number, since it uses as much as digits as its factorization.

161715487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54688.

The product of its digits is 47040, while the sum is 40.

The square root of 161715487 is about 12716.7404235519. The cubic root of 161715487 is about 544.8168584765.

The spelling of 161715487 in words is "one hundred sixty-one million, seven hundred fifteen thousand, four hundred eighty-seven".