1249081656 has 32 divisors (see below), whose sum is σ = 3123914640. Its totient is φ = 416199168.

The previous prime is 1249081643. The next prime is 1249081693. The reversal of 1249081656 is 6561809421.

1249081656 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64320 + ... + 81456.

Almost surely, 2^1249081656 is an apocalyptic number.

It is an amenable number.

1249081656 is an abundant number, since it is smaller than the sum of its proper divisors (1874832984).

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

1249081656 is a wasteful number, since it uses less digits than its factorization.

1249081656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20183 (or 20179 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 1249081656 is about 35342.3493276834. The cubic root of 1249081656 is about 1076.9534787639.

The spelling of 1249081656 in words is "one billion, two hundred forty-nine million, eighty-one thousand, six hundred fifty-six".