981097805 has 8 divisors (see below), whose sum is σ = 1177887744. Its totient is φ = 784498000.

The previous prime is 981097783. The next prime is 981097807. The reversal of 981097805 is 508790189.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-981097805 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 981097805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981097807) 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, 35921 + ... + 57030.

It is an arithmetic number, because the mean of its divisors is an integer number (147235968).

Almost surely, 2^981097805 is an apocalyptic number.

It is an amenable number.

981097805 is a deficient number, since it is larger than the sum of its proper divisors (196789939).

981097805 is a wasteful number, since it uses less digits than its factorization.

981097805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95067.

The product of its (nonzero) digits is 181440, while the sum is 47.

The square root of 981097805 is about 31322.4808244813. The cubic root of 981097805 is about 993.6591468962.

The spelling of 981097805 in words is "nine hundred eighty-one million, ninety-seven thousand, eight hundred five".