1561171006 has 8 divisors (see below), whose sum is σ = 2342886984. Its totient is φ = 780208680.

The previous prime is 1561170997. The next prime is 1561171009. The reversal of 1561171006 is 6001711651.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561171009) 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, 183205 + ... + 191536.

It is an arithmetic number, because the mean of its divisors is an integer number (292860873).

Almost surely, 2^1561171006 is an apocalyptic number.

1561171006 is a deficient number, since it is larger than the sum of its proper divisors (781715978).

1561171006 is a wasteful number, since it uses less digits than its factorization.

1561171006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376826.

The product of its (nonzero) digits is 1260, while the sum is 28.

The square root of 1561171006 is about 39511.6565838488. The cubic root of 1561171006 is about 1160.0681207518.

Adding to 1561171006 its reverse (6001711651), we get a palindrome (7562882657).

The spelling of 1561171006 in words is "one billion, five hundred sixty-one million, one hundred seventy-one thousand, six".