1261344059 has 4 divisors (see below), whose sum is σ = 1274347704. Its totient is φ = 1248340416.

The previous prime is 1261344047. The next prime is 1261344079. The reversal of 1261344059 is 9504431621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1261344059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1261344079) 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 3 ways as a sum of consecutive naturals, for example, 6501677 + ... + 6501870.

It is an arithmetic number, because the mean of its divisors is an integer number (318586926).

Almost surely, 2^1261344059 is an apocalyptic number.

1261344059 is a deficient number, since it is larger than the sum of its proper divisors (13003645).

1261344059 is an equidigital number, since it uses as much as digits as its factorization.

1261344059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13003644.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 1261344059 is about 35515.4059388317. The cubic root of 1261344059 is about 1080.4662079005.

The spelling of 1261344059 in words is "one billion, two hundred sixty-one million, three hundred forty-four thousand, fifty-nine".