1249361816 has 32 divisors (see below), whose sum is σ = 2411035200. Its totient is φ = 606675360.

The previous prime is 1249361791. The next prime is 1249361821. The reversal of 1249361816 is 6181639421.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23231 + ... + 55121.

It is an arithmetic number, because the mean of its divisors is an integer number (75344850).

Almost surely, 2^1249361816 is an apocalyptic number.

It is an amenable number.

1249361816 is a deficient number, since it is larger than the sum of its proper divisors (1161673384).

1249361816 is a wasteful number, since it uses less digits than its factorization.

1249361816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32039 (or 32035 counting only the distinct ones).

The product of its digits is 62208, while the sum is 41.

The square root of 1249361816 is about 35346.3126223939. The cubic root of 1249361816 is about 1077.0339903756.

The spelling of 1249361816 in words is "one billion, two hundred forty-nine million, three hundred sixty-one thousand, eight hundred sixteen".