1916422561 has 8 divisors (see below), whose sum is σ = 1925769384. Its totient is φ = 1907093760.

The previous prime is 1916422559. The next prime is 1916422567. The reversal of 1916422561 is 1652246191.

It can be written as a sum of positive squares in 4 ways, for example, as 149817600 + 1766604961 = 12240^2 + 42031^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1916422561 - 2¹ = 1916422559 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 1916422561.

It is not an unprimeable number, because it can be changed into a prime (1916422567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240111 + ... + 247963.

It is an arithmetic number, because the mean of its divisors is an integer number (240721173).

Almost surely, 2^1916422561 is an apocalyptic number.

It is an amenable number.

1916422561 is a deficient number, since it is larger than the sum of its proper divisors (9346823).

1916422561 is an equidigital number, since it uses as much as digits as its factorization.

1916422561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9011.

The product of its digits is 25920, while the sum is 37.

The square root of 1916422561 is about 43776.9638166011. The cubic root of 1916422561 is about 1242.1205825326.

The spelling of 1916422561 in words is "one billion, nine hundred sixteen million, four hundred twenty-two thousand, five hundred sixty-one".