1913147965 has 4 divisors (see below), whose sum is σ = 2295777564. Its totient is φ = 1530518368.

The previous prime is 1913147933. The next prime is 1913147987. The reversal of 1913147965 is 5697413191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5697413191 = 23 ⋅247713617.

It can be written as a sum of positive squares in 2 ways, for example, as 403126084 + 1510021881 = 20078^2 + 38859^2 .

It is a cyclic number.

It is not a de Polignac number, because 1913147965 - 2⁵ = 1913147933 is a prime.

It is a Duffinian number.

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, 191314792 + ... + 191314801.

It is an arithmetic number, because the mean of its divisors is an integer number (573944391).

Almost surely, 2^1913147965 is an apocalyptic number.

It is an amenable number.

1913147965 is a deficient number, since it is larger than the sum of its proper divisors (382629599).

1913147965 is an equidigital number, since it uses as much as digits as its factorization.

1913147965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382629598.

The product of its digits is 204120, while the sum is 46.

The square root of 1913147965 is about 43739.5469226648. The cubic root of 1913147965 is about 1241.4127076866.

It can be divided in two parts, 1913 and 147965, that added together give a triangular number (149878 = T₅₄₇).

The spelling of 1913147965 in words is "one billion, nine hundred thirteen million, one hundred forty-seven thousand, nine hundred sixty-five".