1315945777 has 4 divisors (see below), whose sum is σ = 1319921776. Its totient is φ = 1311969780.

The previous prime is 1315945769. The next prime is 1315945783. The reversal of 1315945777 is 7775495131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7775495131 = 79 ⋅98423989.

It is a cyclic number.

It is not a de Polignac number, because 1315945777 - 2³ = 1315945769 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1315945777.

It is not an unprimeable number, because it can be changed into a prime (1315945577) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1987503 + ... + 1988164.

It is an arithmetic number, because the mean of its divisors is an integer number (329980444).

Almost surely, 2^1315945777 is an apocalyptic number.

It is an amenable number.

1315945777 is a deficient number, since it is larger than the sum of its proper divisors (3975999).

1315945777 is an equidigital number, since it uses as much as digits as its factorization.

1315945777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3975998.

The product of its digits is 926100, while the sum is 49.

The square root of 1315945777 is about 36275.9669340460. The cubic root of 1315945777 is about 1095.8370966723.

The spelling of 1315945777 in words is "one billion, three hundred fifteen million, nine hundred forty-five thousand, seven hundred seventy-seven".