1561431106 has 8 divisors (see below), whose sum is σ = 2381844240. Its totient is φ = 767483028.

The previous prime is 1561431101. The next prime is 1561431119. The reversal of 1561431106 is 6011341651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1561431101) 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, 6616116 + ... + 6616351.

It is an arithmetic number, because the mean of its divisors is an integer number (297730530).

Almost surely, 2^1561431106 is an apocalyptic number.

1561431106 is a deficient number, since it is larger than the sum of its proper divisors (820413134).

1561431106 is a wasteful number, since it uses less digits than its factorization.

1561431106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13232528.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 1561431106 is about 39514.9478805173. The cubic root of 1561431106 is about 1160.1325418310.

Adding to 1561431106 its reverse (6011341651), we get a palindrome (7572772757).

The spelling of 1561431106 in words is "one billion, five hundred sixty-one million, four hundred thirty-one thousand, one hundred six".