981581327 has 8 divisors (see below), whose sum is σ = 1034402400. Its totient is φ = 929605600.

The previous prime is 981581291. The next prime is 981581333. The reversal of 981581327 is 723185189.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-981581327 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 (981581347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208952 + ... + 213597.

It is an arithmetic number, because the mean of its divisors is an integer number (129300300).

Almost surely, 2^981581327 is an apocalyptic number.

981581327 is a deficient number, since it is larger than the sum of its proper divisors (52821073).

981581327 is a wasteful number, since it uses less digits than its factorization.

981581327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422673.

The product of its digits is 120960, while the sum is 44.

The square root of 981581327 is about 31330.1983236621. The cubic root of 981581327 is about 993.8223576547.

The spelling of 981581327 in words is "nine hundred eighty-one million, five hundred eighty-one thousand, three hundred twenty-seven".