1312640677 has 4 divisors (see below), whose sum is σ = 1313255916. Its totient is φ = 1312025440.

The previous prime is 1312640653. The next prime is 1312640689. The reversal of 1312640677 is 7760462131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1270637316 + 42003361 = 35646^2 + 6481^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312640677 - 2¹⁵ = 1312607909 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 (1312641677) 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 3 ways as a sum of consecutive naturals, for example, 304408 + ... + 308689.

It is an arithmetic number, because the mean of its divisors is an integer number (328313979).

Almost surely, 2^1312640677 is an apocalyptic number.

It is an amenable number.

1312640677 is a deficient number, since it is larger than the sum of its proper divisors (615239).

1312640677 is an equidigital number, since it uses as much as digits as its factorization.

1312640677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615238.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 1312640677 is about 36230.3833405058. The cubic root of 1312640677 is about 1094.9189008833.

The spelling of 1312640677 in words is "one billion, three hundred twelve million, six hundred forty thousand, six hundred seventy-seven".