1261227536 has 20 divisors (see below), whose sum is σ = 2452458732. Its totient is φ = 628334976.

The previous prime is 1261227493. The next prime is 1261227551. The reversal of 1261227536 is 6357221621.

It can be written as a sum of positive squares in 2 ways, for example, as 844251136 + 416976400 = 29056^2 + 20420^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1261227496 and 1261227505.

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 3 ways as a sum of consecutive naturals, for example, 137855 + ... + 146718.

Almost surely, 2^1261227536 is an apocalyptic number.

1261227536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1261227536 is a deficient number, since it is larger than the sum of its proper divisors (1191231196).

1261227536 is a wasteful number, since it uses less digits than its factorization.

1261227536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284858 (or 284852 counting only the distinct ones).

The product of its digits is 30240, while the sum is 35.

The square root of 1261227536 is about 35513.7654438388. The cubic root of 1261227536 is about 1080.4329357096.

The spelling of 1261227536 in words is "one billion, two hundred sixty-one million, two hundred twenty-seven thousand, five hundred thirty-six".