1261616108 has 6 divisors (see below), whose sum is σ = 2207828196. Its totient is φ = 630808052.

The previous prime is 1261616107. The next prime is 1261616119. The reversal of 1261616108 is 8016161621.

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 as a sum of consecutive naturals, namely, 157702010 + ... + 157702017.

It is an arithmetic number, because the mean of its divisors is an integer number (367971366).

Almost surely, 2^1261616108 is an apocalyptic number.

It is an amenable number.

1261616108 is a deficient number, since it is larger than the sum of its proper divisors (946212088).

1261616108 is a wasteful number, since it uses less digits than its factorization.

1261616108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315404031 (or 315404029 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 1261616108 is about 35519.2357462826. The cubic root of 1261616108 is about 1080.5438812943.

Adding to 1261616108 its reverse (8016161621), we get a palindrome (9277777729).

The spelling of 1261616108 in words is "one billion, two hundred sixty-one million, six hundred sixteen thousand, one hundred eight".