1944979901 has 4 divisors (see below), whose sum is σ = 1945807452. Its totient is φ = 1944152352.

The previous prime is 1944979847. The next prime is 1944979961. The reversal of 1944979901 is 1099794491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1099794491 = 9613 ⋅114407.

It can be written as a sum of positive squares in 2 ways, for example, as 1334148676 + 610831225 = 36526^2 + 24715^2 .

It is a cyclic number.

It is not a de Polignac number, because 1944979901 - 2⁶ = 1944979837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1944979961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 410240 + ... + 414953.

It is an arithmetic number, because the mean of its divisors is an integer number (486451863).

Almost surely, 2^1944979901 is an apocalyptic number.

It is an amenable number.

1944979901 is a deficient number, since it is larger than the sum of its proper divisors (827551).

1944979901 is an equidigital number, since it uses as much as digits as its factorization.

1944979901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827550.

The product of its (nonzero) digits is 734832, while the sum is 53.

The square root of 1944979901 is about 44101.9262731233. The cubic root of 1944979901 is about 1248.2599578065.

The spelling of 1944979901 in words is "one billion, nine hundred forty-four million, nine hundred seventy-nine thousand, nine hundred one".