981173953 has 4 divisors (see below), whose sum is σ = 997804080. Its totient is φ = 964543828.

The previous prime is 981173891. The next prime is 981173981. The reversal of 981173953 is 359371189.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-981173953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981113953) 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, 8314975 + ... + 8315092.

It is an arithmetic number, because the mean of its divisors is an integer number (249451020).

Almost surely, 2^981173953 is an apocalyptic number.

It is an amenable number.

981173953 is a deficient number, since it is larger than the sum of its proper divisors (16630127).

981173953 is a wasteful number, since it uses less digits than its factorization.

981173953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16630126.

The product of its digits is 204120, while the sum is 46.

The square root of 981173953 is about 31323.6963495690. The cubic root of 981173953 is about 993.6848538811.

The spelling of 981173953 in words is "nine hundred eighty-one million, one hundred seventy-three thousand, nine hundred fifty-three".