1261341915 has 8 divisors (see below), whose sum is σ = 2018147088. Its totient is φ = 672715680.

The previous prime is 1261341901. The next prime is 1261341931. The reversal of 1261341915 is 5191431621.

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

It is not a de Polignac number, because 1261341915 - 2⁴ = 1261341899 is a prime.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 42044716 + ... + 42044745.

It is an arithmetic number, because the mean of its divisors is an integer number (252268386).

Almost surely, 2^1261341915 is an apocalyptic number.

1261341915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1261341915 is a deficient number, since it is larger than the sum of its proper divisors (756805173).

1261341915 is an equidigital number, since it uses as much as digits as its factorization.

1261341915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84089469.

The product of its digits is 6480, while the sum is 33.

The square root of 1261341915 is about 35515.3757547347. The cubic root of 1261341915 is about 1080.4655957173.

The spelling of 1261341915 in words is "one billion, two hundred sixty-one million, three hundred forty-one thousand, nine hundred fifteen".