1634221465 has 4 divisors (see below), whose sum is σ = 1961065764. Its totient is φ = 1307377168.

The previous prime is 1634221423. The next prime is 1634221469. The reversal of 1634221465 is 5641224361.

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 520798041 + 1113423424 = 22821^2 + 33368^2 .

It is a cyclic number.

It is not a de Polignac number, because 1634221465 - 2²¹ = 1632124313 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 1634221465.

It is not an unprimeable number, because it can be changed into a prime (1634221469) 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, 163422142 + ... + 163422151.

It is an arithmetic number, because the mean of its divisors is an integer number (490266441).

Almost surely, 2^1634221465 is an apocalyptic number.

It is an amenable number.

1634221465 is a deficient number, since it is larger than the sum of its proper divisors (326844299).

1634221465 is an equidigital number, since it uses as much as digits as its factorization.

1634221465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326844298.

The product of its digits is 34560, while the sum is 34.

The square root of 1634221465 is about 40425.5051298064. The cubic root of 1634221465 is about 1177.8870222840.

The spelling of 1634221465 in words is "one billion, six hundred thirty-four million, two hundred twenty-one thousand, four hundred sixty-five".