1277315645 has 8 divisors (see below), whose sum is σ = 1568425056. Its totient is φ = 998088336.

The previous prime is 1277315617. The next prime is 1277315647. The reversal of 1277315645 is 5465137721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1277315645 - 2¹⁶ = 1277250109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1277315647) 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 in 7 ways as a sum of consecutive naturals, for example, 2970287 + ... + 2970716.

It is an arithmetic number, because the mean of its divisors is an integer number (196053132).

Almost surely, 2^1277315645 is an apocalyptic number.

It is an amenable number.

1277315645 is a deficient number, since it is larger than the sum of its proper divisors (291109411).

1277315645 is an equidigital number, since it uses as much as digits as its factorization.

1277315645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5941051.

The product of its digits is 176400, while the sum is 41.

The square root of 1277315645 is about 35739.5529490787. The cubic root of 1277315645 is about 1085.0075091328.

The spelling of 1277315645 in words is "one billion, two hundred seventy-seven million, three hundred fifteen thousand, six hundred forty-five".