1261590012 has 48 divisors (see below), whose sum is σ = 3376307200. Its totient is φ = 406963440.

The previous prime is 1261589963. The next prime is 1261590017. The reversal of 1261590012 is 2100951621.

1261590012 is a `hidden beast` number, since 1 + 2 + 61 + 590 + 0 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261590017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 185062 + ... + 191757.

Almost surely, 2^1261590012 is an apocalyptic number.

1261590012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1261590012 is an abundant number, since it is smaller than the sum of its proper divisors (2114717188).

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

1261590012 is a wasteful number, since it uses less digits than its factorization.

1261590012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376863 (or 376855 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 1261590012 is about 35518.8683941367. The cubic root of 1261590012 is about 1080.5364310439.

The spelling of 1261590012 in words is "one billion, two hundred sixty-one million, five hundred ninety thousand, twelve".