1980542813 has 4 divisors (see below), whose sum is σ = 1999771488. Its totient is φ = 1961314140.

The previous prime is 1980542783. The next prime is 1980542819. The reversal of 1980542813 is 3182450891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3182450891 = 41611 ⋅76481.

It is a cyclic number.

It is not a de Polignac number, because 1980542813 - 2¹⁸ = 1980280669 is a prime.

It is a super-3 number, since 3×1980542813³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980542819) 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, 9614183 + ... + 9614388.

It is an arithmetic number, because the mean of its divisors is an integer number (499942872).

Almost surely, 2^1980542813 is an apocalyptic number.

It is an amenable number.

1980542813 is a deficient number, since it is larger than the sum of its proper divisors (19228675).

1980542813 is a wasteful number, since it uses less digits than its factorization.

1980542813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19228674.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 1980542813 is about 44503.2899120953. The cubic root of 1980542813 is about 1255.8219750266.

The spelling of 1980542813 in words is "one billion, nine hundred eighty million, five hundred forty-two thousand, eight hundred thirteen".