1261538704 has 10 divisors (see below), whose sum is σ = 2444231270. Its totient is φ = 630769344.

The previous prime is 1261538699. The next prime is 1261538741. The reversal of 1261538704 is 4078351621.

It can be written as a sum of positive squares in only one way, i.e., 1250329600 + 11209104 = 35360^2 + 3348^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 39423069 + ... + 39423100.

It is an arithmetic number, because the mean of its divisors is an integer number (244423127).

Almost surely, 2^1261538704 is an apocalyptic number.

It is an amenable number.

1261538704 is a deficient number, since it is larger than the sum of its proper divisors (1182692566).

1261538704 is an equidigital number, since it uses as much as digits as its factorization.

1261538704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78846177 (or 78846171 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 1261538704 is about 35518.1461227919. The cubic root of 1261538704 is about 1080.5217826203.

The spelling of 1261538704 in words is "one billion, two hundred sixty-one million, five hundred thirty-eight thousand, seven hundred four".