1261286496 has 36 divisors (see below), whose sum is σ = 3586784292. Its totient is φ = 420428736.

The previous prime is 1261286461. The next prime is 1261286497. The reversal of 1261286496 is 6946821621.

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261286497) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2189446 + ... + 2190021.

It is an arithmetic number, because the mean of its divisors is an integer number (99632897).

Almost surely, 2^1261286496 is an apocalyptic number.

1261286496 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1261286496 is an abundant number, since it is smaller than the sum of its proper divisors (2325497796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1261286496 is a wasteful number, since it uses less digits than its factorization.

1261286496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4379483 (or 4379472 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 1261286496 is about 35514.5955347939. The cubic root of 1261286496 is about 1080.4497715121.

The spelling of 1261286496 in words is "one billion, two hundred sixty-one million, two hundred eighty-six thousand, four hundred ninety-six".