1913167645 has 4 divisors (see below), whose sum is σ = 2295801180. Its totient is φ = 1530534112.

The previous prime is 1913167643. The next prime is 1913167651. The reversal of 1913167645 is 5467613191.

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 861657316 + 1051510329 = 29354^2 + 32427^2 .

It is a cyclic number.

It is not a de Polignac number, because 1913167645 - 2¹ = 1913167643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1913167643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191316760 + ... + 191316769.

It is an arithmetic number, because the mean of its divisors is an integer number (573950295).

Almost surely, 2^1913167645 is an apocalyptic number.

It is an amenable number.

1913167645 is a deficient number, since it is larger than the sum of its proper divisors (382633535).

1913167645 is an equidigital number, since it uses as much as digits as its factorization.

1913167645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382633534.

The product of its digits is 136080, while the sum is 43.

The square root of 1913167645 is about 43739.7718901231. The cubic root of 1913167645 is about 1241.4169643565.

The spelling of 1913167645 in words is "one billion, nine hundred thirteen million, one hundred sixty-seven thousand, six hundred forty-five".