1561455044 has 12 divisors (see below), whose sum is σ = 2796094224. Its totient is φ = 762570984.

The previous prime is 1561455043. The next prime is 1561455053. The reversal of 1561455044 is 4405541651.

It is a junction number, because it is equal to n+sod(n) for n = 1561454995 and 1561455013.

It is not an unprimeable number, because it can be changed into a prime (1561455041) 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, 4538942 + ... + 4539285.

It is an arithmetic number, because the mean of its divisors is an integer number (233007852).

Almost surely, 2^1561455044 is an apocalyptic number.

It is an amenable number.

1561455044 is a deficient number, since it is larger than the sum of its proper divisors (1234639180).

1561455044 is a wasteful number, since it uses less digits than its factorization.

1561455044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9078274 (or 9078272 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 35.

The square root of 1561455044 is about 39515.2507773897. The cubic root of 1561455044 is about 1160.1384703903.

Adding to 1561455044 its reverse (4405541651), we get a palindrome (5966996695).

The spelling of 1561455044 in words is "one billion, five hundred sixty-one million, four hundred fifty-five thousand, forty-four".