981355667 has 4 divisors (see below), whose sum is σ = 990359040. Its totient is φ = 972352296.

The previous prime is 981355663. The next prime is 981355709. The reversal of 981355667 is 766553189.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 981355667 - 2² = 981355663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981355663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4501523 + ... + 4501740.

It is an arithmetic number, because the mean of its divisors is an integer number (247589760).

Almost surely, 2^981355667 is an apocalyptic number.

981355667 is a deficient number, since it is larger than the sum of its proper divisors (9003373).

981355667 is a wasteful number, since it uses less digits than its factorization.

981355667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9003372.

The product of its digits is 1360800, while the sum is 50.

The square root of 981355667 is about 31326.5967988864. The cubic root of 981355667 is about 993.7461937700.

The spelling of 981355667 in words is "nine hundred eighty-one million, three hundred fifty-five thousand, six hundred sixty-seven".