1261012508 has 12 divisors (see below), whose sum is σ = 2522025072. Its totient is φ = 540433920.

The previous prime is 1261012507. The next prime is 1261012531. The reversal of 1261012508 is 8052101621.

1261012508 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261012507) by changing a digit.

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, 22518053 + ... + 22518108.

It is an arithmetic number, because the mean of its divisors is an integer number (210168756).

Almost surely, 2^1261012508 is an apocalyptic number.

It is an amenable number.

1261012508 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1261012508 is a wasteful number, since it uses less digits than its factorization.

1261012508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45036172 (or 45036170 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 1261012508 is about 35510.7379253093. The cubic root of 1261012508 is about 1080.3715308398.

The spelling of 1261012508 in words is "one billion, two hundred sixty-one million, twelve thousand, five hundred eight".