1261616107 has 2 divisors, whose sum is σ = 1261616108. Its totient is φ = 1261616106.

The previous prime is 1261616089. The next prime is 1261616119. The reversal of 1261616107 is 7016161621.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1261616107 is a prime.

It is not a weakly prime, because it can be changed into another prime (1261616197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630808053 + 630808054.

It is an arithmetic number, because the mean of its divisors is an integer number (630808054).

Almost surely, 2^1261616107 is an apocalyptic number.

1261616107 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261616107 is an equidigital number, since it uses as much as digits as its factorization.

1261616107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 1261616107 is about 35519.2357322057. The cubic root of 1261616107 is about 1080.5438810088.

Adding to 1261616107 its reverse (7016161621), we get a palindrome (8277777728).

The spelling of 1261616107 in words is "one billion, two hundred sixty-one million, six hundred sixteen thousand, one hundred seven".