15485551 has 4 divisors (see below), whose sum is σ = 16300600. Its totient is φ = 14670504.

The previous prime is 15485549. The next prime is 15485557. The reversal of 15485551 is 15558451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15558451 = 17 ⋅915203.

It is a cyclic number.

It is not a de Polignac number, because 15485551 - 2¹ = 15485549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15485557) 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, 407496 + ... + 407533.

It is an arithmetic number, because the mean of its divisors is an integer number (4075150).

Almost surely, 2^15485551 is an apocalyptic number.

15485551 is a deficient number, since it is larger than the sum of its proper divisors (815049).

15485551 is an equidigital number, since it uses as much as digits as its factorization.

15485551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815048.

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

The square root of 15485551 is about 3935.1684843219. The cubic root of 15485551 is about 249.2540484388.

Subtracting 15485551 from its reverse (15558451), we obtain a square (72900 = 270²).

The spelling of 15485551 in words is "fifteen million, four hundred eighty-five thousand, five hundred fifty-one".