971200981 has 4 divisors (see below), whose sum is σ = 1004690700. Its totient is φ = 937711264.

The previous prime is 971200963. The next prime is 971200999. The reversal of 971200981 is 189002179.

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

It is an interprime number because it is at equal distance from previous prime (971200963) and next prime (971200999).

It can be written as a sum of positive squares in 2 ways, for example, as 759498481 + 211702500 = 27559^2 + 14550^2 .

It is a cyclic number.

It is not a de Polignac number, because 971200981 - 2¹⁵ = 971168213 is a prime.

It is a super-2 number, since 2×971200981² = 1886462690990724722, which contains 22 as substring.

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 971200981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (971200961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16744816 + ... + 16744873.

It is an arithmetic number, because the mean of its divisors is an integer number (251172675).

Almost surely, 2^971200981 is an apocalyptic number.

It is an amenable number.

971200981 is a deficient number, since it is larger than the sum of its proper divisors (33489719).

971200981 is a wasteful number, since it uses less digits than its factorization.

971200981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33489718.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 971200981 is about 31164.0976285212. The cubic root of 971200981 is about 990.3066699497.

The spelling of 971200981 in words is "nine hundred seventy-one million, two hundred thousand, nine hundred eighty-one".