15555481 has 4 divisors (see below), whose sum is σ = 15568000. Its totient is φ = 15542964.

The previous prime is 15555479. The next prime is 15555511. The reversal of 15555481 is 18455551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18455551 = 197 ⋅93683.

It is a cyclic number.

It is not a de Polignac number, because 15555481 - 2¹ = 15555479 is a prime.

It is a super-2 number, since 2×15555481² = 483945978282722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15555401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4161 + ... + 6958.

It is an arithmetic number, because the mean of its divisors is an integer number (3892000).

Almost surely, 2^15555481 is an apocalyptic number.

It is an amenable number.

15555481 is a deficient number, since it is larger than the sum of its proper divisors (12519).

15555481 is a wasteful number, since it uses less digits than its factorization.

15555481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12518.

The product of its digits is 20000, while the sum is 34.

The square root of 15555481 is about 3944.0437370800. The cubic root of 15555481 is about 249.6286807611.

The spelling of 15555481 in words is "fifteen million, five hundred fifty-five thousand, four hundred eighty-one".