161516001 has 8 divisors (see below), whose sum is σ = 216321280. Its totient is φ = 107194032.

The previous prime is 161515999. The next prime is 161516009. The reversal of 161516001 is 100615161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161516001 - 2¹ = 161515999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161516009) 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 7 ways as a sum of consecutive naturals, for example, 120046 + ... + 121383.

It is an arithmetic number, because the mean of its divisors is an integer number (27040160).

Almost surely, 2^161516001 is an apocalyptic number.

It is an amenable number.

161516001 is a deficient number, since it is larger than the sum of its proper divisors (54805279).

161516001 is a wasteful number, since it uses less digits than its factorization.

161516001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241655.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 161516001 is about 12708.8945624708. The cubic root of 161516001 is about 544.5927445966.

The spelling of 161516001 in words is "one hundred sixty-one million, five hundred sixteen thousand, one".