1261260615 has 16 divisors (see below), whose sum is σ = 2022386688. Its totient is φ = 671215776.

The previous prime is 1261260601. The next prime is 1261260619. The reversal of 1261260615 is 5160621621.

It is not a de Polignac number, because 1261260615 - 2¹⁰ = 1261259591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261260619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83859 + ... + 97748.

It is an arithmetic number, because the mean of its divisors is an integer number (126399168).

Almost surely, 2^1261260615 is an apocalyptic number.

1261260615 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1261260615 is a deficient number, since it is larger than the sum of its proper divisors (761126073).

1261260615 is a wasteful number, since it uses less digits than its factorization.

1261260615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182078.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 1261260615 is about 35514.2311616062. The cubic root of 1261260615 is about 1080.4423813561.

The spelling of 1261260615 in words is "one billion, two hundred sixty-one million, two hundred sixty thousand, six hundred fifteen".