1981492355 has 4 divisors (see below), whose sum is σ = 2377790832. Its totient is φ = 1585193880.

The previous prime is 1981492333. The next prime is 1981492369. The reversal of 1981492355 is 5532941891.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1981492355 - 2⁸ = 1981492099 is a prime.

It is a super-3 number, since 3×1981492355³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198149231 + ... + 198149240.

It is an arithmetic number, because the mean of its divisors is an integer number (594447708).

Almost surely, 2^1981492355 is an apocalyptic number.

1981492355 is a deficient number, since it is larger than the sum of its proper divisors (396298477).

1981492355 is an equidigital number, since it uses as much as digits as its factorization.

1981492355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396298476.

The product of its digits is 388800, while the sum is 47.

The square root of 1981492355 is about 44513.9568562490. The cubic root of 1981492355 is about 1256.0226380611.

The spelling of 1981492355 in words is "one billion, nine hundred eighty-one million, four hundred ninety-two thousand, three hundred fifty-five".