1261281336 has 32 divisors (see below), whose sum is σ = 3603661440. Its totient is φ = 360366048.

The previous prime is 1261281293. The next prime is 1261281349. The reversal of 1261281336 is 6331821621.

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

It is a junction number, because it is equal to n+sod(n) for n = 1261281297 and 1261281306.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 3753646 + ... + 3753981.

It is an arithmetic number, because the mean of its divisors is an integer number (112614420).

Almost surely, 2^1261281336 is an apocalyptic number.

It is an amenable number.

1261281336 is an abundant number, since it is smaller than the sum of its proper divisors (2342380104).

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

1261281336 is a wasteful number, since it uses less digits than its factorization.

1261281336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7507643 (or 7507639 counting only the distinct ones).

The product of its digits is 10368, while the sum is 33.

The square root of 1261281336 is about 35514.5228885311. The cubic root of 1261281336 is about 1080.4482981148.

The spelling of 1261281336 in words is "one billion, two hundred sixty-one million, two hundred eighty-one thousand, three hundred thirty-six".