1561502224 has 40 divisors (see below), whose sum is σ = 3206466648. Its totient is φ = 734115840.

The previous prime is 1561502221. The next prime is 1561502227. The reversal of 1561502224 is 4222051651.

It is an interprime number because it is at equal distance from previous prime (1561502221) and next prime (1561502227).

It can be written as a sum of positive squares in 4 ways, for example, as 352688400 + 1208813824 = 18780^2 + 34768^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1561502192 and 1561502201.

It is not an unprimeable number, because it can be changed into a prime (1561502221) by changing a digit.

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, 373554 + ... + 377710.

Almost surely, 2^1561502224 is an apocalyptic number.

It is an amenable number.

1561502224 is an abundant number, since it is smaller than the sum of its proper divisors (1644964424).

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

1561502224 is a wasteful number, since it uses less digits than its factorization.

1561502224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5563 (or 5557 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 1561502224 is about 39515.8477575770. The cubic root of 1561502224 is about 1160.1501549581.

Adding to 1561502224 its reverse (4222051651), we get a palindrome (5783553875).

The spelling of 1561502224 in words is "one billion, five hundred sixty-one million, five hundred two thousand, two hundred twenty-four".