981123947 has 4 divisors (see below), whose sum is σ = 995767656. Its totient is φ = 966480240.

The previous prime is 981123943. The next prime is 981123959. The reversal of 981123947 is 749321189.

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 981123947 - 2² = 981123943 is a prime.

It is a super-3 number, since 3×981123947³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 981123898 and 981123907.

It is not an unprimeable number, because it can be changed into a prime (981123943) 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, 7321754 + ... + 7321887.

It is an arithmetic number, because the mean of its divisors is an integer number (248941914).

Almost surely, 2^981123947 is an apocalyptic number.

981123947 is a deficient number, since it is larger than the sum of its proper divisors (14643709).

981123947 is a wasteful number, since it uses less digits than its factorization.

981123947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14643708.

The product of its digits is 108864, while the sum is 44.

The square root of 981123947 is about 31322.8981258120. The cubic root of 981123947 is about 993.6679723863.

The spelling of 981123947 in words is "nine hundred eighty-one million, one hundred twenty-three thousand, nine hundred forty-seven".