1261484872 has 8 divisors (see below), whose sum is σ = 2365284150. Its totient is φ = 630742432.

The previous prime is 1261484831. The next prime is 1261484893. The reversal of 1261484872 is 2784841621.

It can be written as a sum of positive squares in only one way, i.e., 829094436 + 432390436 = 28794^2 + 20794^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78842797 + ... + 78842812.

Almost surely, 2^1261484872 is an apocalyptic number.

It is an amenable number.

1261484872 is a deficient number, since it is larger than the sum of its proper divisors (1103799278).

1261484872 is a wasteful number, since it uses less digits than its factorization.

1261484872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157685615 (or 157685611 counting only the distinct ones).

The product of its digits is 172032, while the sum is 43.

The square root of 1261484872 is about 35517.3883048853. The cubic root of 1261484872 is about 1080.5064131682.

The spelling of 1261484872 in words is "one billion, two hundred sixty-one million, four hundred eighty-four thousand, eight hundred seventy-two".