1984956913 has 4 divisors (see below), whose sum is σ = 1990060020. Its totient is φ = 1979853808.

The previous prime is 1984956899. The next prime is 1984956917. The reversal of 1984956913 is 3196594891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3196594891 = 7 ⋅456656413.

It can be written as a sum of positive squares in 2 ways, for example, as 1356301584 + 628655329 = 36828^2 + 25073^2 .

It is a cyclic number.

It is not a de Polignac number, because 1984956913 - 2²⁹ = 1448086001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1984956917) 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, 2550970 + ... + 2551747.

It is an arithmetic number, because the mean of its divisors is an integer number (497515005).

Almost surely, 2^1984956913 is an apocalyptic number.

It is an amenable number.

1984956913 is a deficient number, since it is larger than the sum of its proper divisors (5103107).

1984956913 is an equidigital number, since it uses as much as digits as its factorization.

1984956913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5103106.

The product of its digits is 2099520, while the sum is 55.

The square root of 1984956913 is about 44552.8552732594. The cubic root of 1984956913 is about 1256.7542464962.

The spelling of 1984956913 in words is "one billion, nine hundred eighty-four million, nine hundred fifty-six thousand, nine hundred thirteen".