1953221345 has 8 divisors (see below), whose sum is σ = 2401033320. Its totient is φ = 1524465280.

The previous prime is 1953221327. The next prime is 1953221363. The reversal of 1953221345 is 5431223591.

It is an interprime number because it is at equal distance from previous prime (1953221327) and next prime (1953221363).

It can be written as a sum of positive squares in 4 ways, for example, as 15108769 + 1938112576 = 3887^2 + 44024^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1953221345 - 2¹⁴ = 1953204961 is a prime.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4763750 + ... + 4764159.

It is an arithmetic number, because the mean of its divisors is an integer number (300129165).

Almost surely, 2^1953221345 is an apocalyptic number.

It is an amenable number.

1953221345 is a deficient number, since it is larger than the sum of its proper divisors (447811975).

1953221345 is an equidigital number, since it uses as much as digits as its factorization.

1953221345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9527955.

The product of its digits is 32400, while the sum is 35.

The square root of 1953221345 is about 44195.2638299626. The cubic root of 1953221345 is about 1250.0205532620.

The spelling of 1953221345 in words is "one billion, nine hundred fifty-three million, two hundred twenty-one thousand, three hundred forty-five".