1261447877 has 8 divisors (see below), whose sum is σ = 1304332800. Its totient is φ = 1218700080.

The previous prime is 1261447843. The next prime is 1261447897. The reversal of 1261447877 is 7787441621.

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

It is a cyclic number.

It is not a de Polignac number, because 1261447877 - 2⁶ = 1261447813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261447897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15398 + ... + 52535.

It is an arithmetic number, because the mean of its divisors is an integer number (163041600).

Almost surely, 2^1261447877 is an apocalyptic number.

It is an amenable number.

1261447877 is a deficient number, since it is larger than the sum of its proper divisors (42884923).

1261447877 is an equidigital number, since it uses as much as digits as its factorization.

1261447877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68563.

The product of its digits is 526848, while the sum is 47.

The square root of 1261447877 is about 35516.8674998232. The cubic root of 1261447877 is about 1080.4958505563.

The spelling of 1261447877 in words is "one billion, two hundred sixty-one million, four hundred forty-seven thousand, eight hundred seventy-seven".