1981349437 has 8 divisors (see below), whose sum is σ = 2024130816. Its totient is φ = 1938594192.

The previous prime is 1981349423. The next prime is 1981349441. The reversal of 1981349437 is 7349431891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1981349437 - 2¹⁹ = 1980825149 is a prime.

It is a super-3 number, since 3×1981349437³ (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 (1981349737) 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 7 ways as a sum of consecutive naturals, for example, 280248 + ... + 287230.

It is an arithmetic number, because the mean of its divisors is an integer number (253016352).

Almost surely, 2^1981349437 is an apocalyptic number.

It is an amenable number.

1981349437 is a deficient number, since it is larger than the sum of its proper divisors (42781379).

1981349437 is an equidigital number, since it uses as much as digits as its factorization.

1981349437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13067.

The product of its digits is 653184, while the sum is 49.

The square root of 1981349437 is about 44512.3515105639. The cubic root of 1981349437 is about 1255.9924398523.

The spelling of 1981349437 in words is "one billion, nine hundred eighty-one million, three hundred forty-nine thousand, four hundred thirty-seven".