15550001 has 8 divisors (see below), whose sum is σ = 16290240. Its totient is φ = 14815152.

The previous prime is 15549983. The next prime is 15550009. The reversal of 15550001 is 10005551.

15550001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 15550001 - 2¹⁰ = 15548977 is a prime.

It is a super-2 number, since 2×15550001² = 483605062200002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15550009) 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, 5315 + ... + 7703.

It is an arithmetic number, because the mean of its divisors is an integer number (2036280).

Almost surely, 2^15550001 is an apocalyptic number.

It is an amenable number.

15550001 is a deficient number, since it is larger than the sum of its proper divisors (740239).

15550001 is a wasteful number, since it uses less digits than its factorization.

15550001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2695.

The product of its (nonzero) digits is 125, while the sum is 17.

The square root of 15550001 is about 3943.3489574219. The cubic root of 15550001 is about 249.5993636383.

Adding to 15550001 its reverse (10005551), we get a palindrome (25555552).

The spelling of 15550001 in words is "fifteen million, five hundred fifty thousand, one".