1249311680 has 56 divisors (see below), whose sum is σ = 3044141232. Its totient is φ = 488097792.

The previous prime is 1249311649. The next prime is 1249311689. The reversal of 1249311680 is 861139421.

It is a self number, because there is not a number n which added to its sum of digits gives 1249311680.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1249311689) 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 7 ways as a sum of consecutive naturals, for example, 31637 + ... + 59156.

Almost surely, 2^1249311680 is an apocalyptic number.

1249311680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1249311680 is an abundant number, since it is smaller than the sum of its proper divisors (1794829552).

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

1249311680 is an equidigital number, since it uses as much as digits as its factorization.

1249311680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90853 (or 90843 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 1249311680 is about 35345.6034041011. The cubic root of 1249311680 is about 1077.0195833138.

The spelling of 1249311680 in words is "one billion, two hundred forty-nine million, three hundred eleven thousand, six hundred eighty".