1277125216 has 24 divisors (see below), whose sum is σ = 2519199144. Its totient is φ = 637328640.

The previous prime is 1277125181. The next prime is 1277125231. The reversal of 1277125216 is 6125217721.

It is a congruent number.

It is an unprimeable number.

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, 21630 + ... + 54973.

It is an arithmetic number, because the mean of its divisors is an integer number (104966631).

Almost surely, 2^1277125216 is an apocalyptic number.

1277125216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1277125216 is a deficient number, since it is larger than the sum of its proper divisors (1242073928).

1277125216 is an equidigital number, since it uses as much as digits as its factorization.

1277125216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77134 (or 77126 counting only the distinct ones).

The product of its digits is 11760, while the sum is 34.

The square root of 1277125216 is about 35736.8887285953. Note that the first 3 decimals coincide. The cubic root of 1277125216 is about 1084.9535868924.

The spelling of 1277125216 in words is "one billion, two hundred seventy-seven million, one hundred twenty-five thousand, two hundred sixteen".