1915959641 has 4 divisors (see below), whose sum is σ = 1967742372. Its totient is φ = 1864176912.

The previous prime is 1915959571. The next prime is 1915959673. The reversal of 1915959641 is 1469595191.

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 852873616 + 1063086025 = 29204^2 + 32605^2 .

It is a cyclic number.

It is not a de Polignac number, because 1915959641 - 2¹⁰ = 1915958617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1915959641.

It is not an unprimeable number, because it can be changed into a prime (1915952641) 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, 25891310 + ... + 25891383.

It is an arithmetic number, because the mean of its divisors is an integer number (491935593).

Almost surely, 2^1915959641 is an apocalyptic number.

It is an amenable number.

1915959641 is a deficient number, since it is larger than the sum of its proper divisors (51782731).

1915959641 is an equidigital number, since it uses as much as digits as its factorization.

1915959641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51782730.

The product of its digits is 437400, while the sum is 50.

The square root of 1915959641 is about 43771.6762416063. The cubic root of 1915959641 is about 1242.0205613132.

The spelling of 1915959641 in words is "one billion, nine hundred fifteen million, nine hundred fifty-nine thousand, six hundred forty-one".