16587961 has 8 divisors (see below), whose sum is σ = 17897544. Its totient is φ = 15283200.

The previous prime is 16587953. The next prime is 16587973. The reversal of 16587961 is 16978561.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4644025 + 11943936 = 2155^2 + 3456^2 .

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 16587961 - 2³ = 16587953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16587941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9561 + ... + 11161.

It is an arithmetic number, because the mean of its divisors is an integer number (2237193).

Almost surely, 2^16587961 is an apocalyptic number.

It is an amenable number.

16587961 is a deficient number, since it is larger than the sum of its proper divisors (1309583).

16587961 is a wasteful number, since it uses less digits than its factorization.

16587961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2411.

The product of its digits is 90720, while the sum is 43.

The square root of 16587961 is about 4072.8320613549. The cubic root of 16587961 is about 255.0337569049.

The spelling of 16587961 in words is "sixteen million, five hundred eighty-seven thousand, nine hundred sixty-one".