1561265036 has 12 divisors (see below), whose sum is σ = 2876014680. Its totient is φ = 739546560.

The previous prime is 1561265033. The next prime is 1561265053. The reversal of 1561265036 is 6305621651.

It is a junction number, because it is equal to n+sod(n) for n = 1561264987 and 1561265005.

It is not an unprimeable number, because it can be changed into a prime (1561265033) 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, 10271405 + ... + 10271556.

It is an arithmetic number, because the mean of its divisors is an integer number (239667890).

Almost surely, 2^1561265036 is an apocalyptic number.

It is an amenable number.

1561265036 is a deficient number, since it is larger than the sum of its proper divisors (1314749644).

1561265036 is a wasteful number, since it uses less digits than its factorization.

1561265036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20542984 (or 20542982 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 1561265036 is about 39512.8464679527. The cubic root of 1561265036 is about 1160.0914107512.

Adding to 1561265036 its reverse (6305621651), we get a palindrome (7866886687).

The spelling of 1561265036 in words is "one billion, five hundred sixty-one million, two hundred sixty-five thousand, thirty-six".