1249121684 has 6 divisors (see below), whose sum is σ = 2185962954. Its totient is φ = 624560840.

The previous prime is 1249121677. The next prime is 1249121689. The reversal of 1249121684 is 4861219421.

It can be written as a sum of positive squares in only one way, i.e., 796368400 + 452753284 = 28220^2 + 21278^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1249121689) 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 as a sum of consecutive naturals, namely, 156140207 + ... + 156140214.

It is an arithmetic number, because the mean of its divisors is an integer number (364327159).

Almost surely, 2^1249121684 is an apocalyptic number.

It is an amenable number.

1249121684 is a deficient number, since it is larger than the sum of its proper divisors (936841270).

1249121684 is a wasteful number, since it uses less digits than its factorization.

1249121684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312280425 (or 312280423 counting only the distinct ones).

The product of its digits is 27648, while the sum is 38.

The square root of 1249121684 is about 35342.9156126090. The cubic root of 1249121684 is about 1076.9649826378.

The spelling of 1249121684 in words is "one billion, two hundred forty-nine million, one hundred twenty-one thousand, six hundred eighty-four".