1980149903 has 4 divisors (see below), whose sum is σ = 2022280800. Its totient is φ = 1938019008.

The previous prime is 1980149867. The next prime is 1980149921. The reversal of 1980149903 is 3099410891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3099410891 = 19 ⋅163126889.

It is a cyclic number.

It is not a de Polignac number, because 1980149903 - 2¹² = 1980145807 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 (1980449903) 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, 21065378 + ... + 21065471.

It is an arithmetic number, because the mean of its divisors is an integer number (505570200).

Almost surely, 2^1980149903 is an apocalyptic number.

1980149903 is a deficient number, since it is larger than the sum of its proper divisors (42130897).

1980149903 is an equidigital number, since it uses as much as digits as its factorization.

1980149903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42130896.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 1980149903 is about 44498.8753003938. The cubic root of 1980149903 is about 1255.7389241172.

The spelling of 1980149903 in words is "one billion, nine hundred eighty million, one hundred forty-nine thousand, nine hundred three".