1261616106 has 8 divisors (see below), whose sum is σ = 2523232224. Its totient is φ = 420538700.

The previous prime is 1261616089. The next prime is 1261616107. The reversal of 1261616106 is 6016161621.

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

1261616106 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (1261616107) 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, 105134670 + ... + 105134681.

It is an arithmetic number, because the mean of its divisors is an integer number (315404028).

Almost surely, 2^1261616106 is an apocalyptic number.

1261616106 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1261616106 is a wasteful number, since it uses less digits than its factorization.

1261616106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210269356.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 1261616106 is about 35519.2357181288. The cubic root of 1261616106 is about 1080.5438807233.

Adding to 1261616106 its reverse (6016161621), we get a palindrome (7277777727).

The spelling of 1261616106 in words is "one billion, two hundred sixty-one million, six hundred sixteen thousand, one hundred six".