1261863707 has 4 divisors (see below), whose sum is σ = 1358930160. Its totient is φ = 1164797256.

The previous prime is 1261863703. The next prime is 1261863731. The reversal of 1261863707 is 7073681621.

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

It is a cyclic number.

It is not a de Polignac number, because 1261863707 - 2² = 1261863703 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1261863703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48533207 + ... + 48533232.

It is an arithmetic number, because the mean of its divisors is an integer number (339732540).

Almost surely, 2^1261863707 is an apocalyptic number.

1261863707 is a deficient number, since it is larger than the sum of its proper divisors (97066453).

1261863707 is an equidigital number, since it uses as much as digits as its factorization.

1261863707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97066452.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 1261863707 is about 35522.7209965678. The cubic root of 1261863707 is about 1080.6145642018.

The spelling of 1261863707 in words is "one billion, two hundred sixty-one million, eight hundred sixty-three thousand, seven hundred seven".