161515001 has 8 divisors (see below), whose sum is σ = 163517640. Its totient is φ = 159522048.

The previous prime is 161514973. The next prime is 161515061. The reversal of 161515001 is 100515161.

It can be written as a sum of positive squares in 4 ways, for example, as 20475625 + 141039376 = 4525^2 + 11876^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 161515001 - 2⁶ = 161514937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161515061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34535 + ... + 38931.

It is an arithmetic number, because the mean of its divisors is an integer number (20439705).

Almost surely, 2^161515001 is an apocalyptic number.

It is an amenable number.

161515001 is a deficient number, since it is larger than the sum of its proper divisors (2002639).

161515001 is a wasteful number, since it uses less digits than its factorization.

161515001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4843.

The product of its (nonzero) digits is 150, while the sum is 20.

The square root of 161515001 is about 12708.8552198851. The cubic root of 161515001 is about 544.5916206752.

The spelling of 161515001 in words is "one hundred sixty-one million, five hundred fifteen thousand, one".