15550985 has 8 divisors (see below), whose sum is σ = 18682440. Its totient is φ = 12426624.

The previous prime is 15550979. The next prime is 15550991. The reversal of 15550985 is 58905551.

It is an interprime number because it is at equal distance from previous prime (15550979) and next prime (15550991).

It can be written as a sum of positive squares in 4 ways, for example, as 6948496 + 8602489 = 2636^2 + 2933^2 .

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 15550985 - 2⁸ = 15550729 is a prime.

It is a Curzon number.

It is an unprimeable number.

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, 7079 + ... + 9011.

It is an arithmetic number, because the mean of its divisors is an integer number (2335305).

Almost surely, 2^15550985 is an apocalyptic number.

It is an amenable number.

15550985 is a deficient number, since it is larger than the sum of its proper divisors (3131455).

15550985 is a wasteful number, since it uses less digits than its factorization.

15550985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3547.

The product of its (nonzero) digits is 45000, while the sum is 38.

The square root of 15550985 is about 3943.4737224939. The cubic root of 15550985 is about 249.6046283881.

The spelling of 15550985 in words is "fifteen million, five hundred fifty thousand, nine hundred eighty-five".