9701981 has 4 divisors (see below), whose sum is σ = 9791100. Its totient is φ = 9612864.

The previous prime is 9701971. The next prime is 9701983. The reversal of 9701981 is 1891079.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1891079 = 277 ⋅6827.

It can be written as a sum of positive squares in 2 ways, for example, as 6205081 + 3496900 = 2491^2 + 1870^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9701981 is a prime.

It is a super-2 number, since 2×9701981² = 188256870648722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9701983) 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, 44396 + ... + 44613.

It is an arithmetic number, because the mean of its divisors is an integer number (2447775).

Almost surely, 2^9701981 is an apocalyptic number.

It is an amenable number.

9701981 is a deficient number, since it is larger than the sum of its proper divisors (89119).

9701981 is a wasteful number, since it uses less digits than its factorization.

9701981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89118.

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 9701981 is about 3114.8003146269. The cubic root of 9701981 is about 213.2816408500.

The spelling of 9701981 in words is "nine million, seven hundred one thousand, nine hundred eighty-one".