15681225 has 72 divisors (see below), whose sum is σ = 32060448. Its totient is φ = 6720000.

The previous prime is 15681223. The next prime is 15681227. The reversal of 15681225 is 52218651.

It is an interprime number because it is at equal distance from previous prime (15681223) and next prime (15681227).

It is not a de Polignac number, because 15681225 - 2¹ = 15681223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15681192 and 15681201.

It is not an unprimeable number, because it can be changed into a prime (15681223) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 62350 + ... + 62600.

It is an arithmetic number, because the mean of its divisors is an integer number (445284).

Almost surely, 2^15681225 is an apocalyptic number.

15681225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15681225 is an abundant number, since it is smaller than the sum of its proper divisors (16379223).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15681225 is a wasteful number, since it uses less digits than its factorization.

15681225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295 (or 283 counting only the distinct ones).

The product of its digits is 4800, while the sum is 30.

The square root of 15681225 is about 3959.9526512321. The cubic root of 15681225 is about 250.2995077039.

Adding to 15681225 its reverse (52218651), we get a palindrome (67899876).

The spelling of 15681225 in words is "fifteen million, six hundred eighty-one thousand, two hundred twenty-five".