1918963201 has 4 divisors (see below), whose sum is σ = 1921371732. Its totient is φ = 1916554672.

The previous prime is 1918963199. The next prime is 1918963217. The reversal of 1918963201 is 1023698191.

1918963201 = 30975² + 30976².

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 959450625 + 959512576 = 30975^2 + 30976^2 .

It is a cyclic number.

It is not a de Polignac number, because 1918963201 - 2¹ = 1918963199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1918963601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1203070 + ... + 1204663.

It is an arithmetic number, because the mean of its divisors is an integer number (480342933).

Almost surely, 2^1918963201 is an apocalyptic number.

1918963201 is the 30976-th centered square number.

It is an amenable number.

1918963201 is a deficient number, since it is larger than the sum of its proper divisors (2408531).

1918963201 is an equidigital number, since it uses as much as digits as its factorization.

1918963201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2408530.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 1918963201 is about 43805.9722069948. The cubic root of 1918963201 is about 1242.6692415752.

The spelling of 1918963201 in words is "one billion, nine hundred eighteen million, nine hundred sixty-three thousand, two hundred one".