981531853 has 4 divisors (see below), whose sum is σ = 981877788. Its totient is φ = 981185920.

The previous prime is 981531851. The next prime is 981531869. The reversal of 981531853 is 358135189.

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

It can be written as a sum of positive squares in 2 ways, for example, as 659616489 + 321915364 = 25683^2 + 17942^2 .

It is a cyclic number.

It is not a de Polignac number, because 981531853 - 2¹ = 981531851 is a prime.

It is a super-2 number, since 2×981531853² = 1926809556907227218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981531851) 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, 168676 + ... + 174397.

It is an arithmetic number, because the mean of its divisors is an integer number (245469447).

Almost surely, 2^981531853 is an apocalyptic number.

It is an amenable number.

981531853 is a deficient number, since it is larger than the sum of its proper divisors (345935).

981531853 is a wasteful number, since it uses less digits than its factorization.

981531853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345934.

The product of its digits is 129600, while the sum is 43.

The square root of 981531853 is about 31329.4087559915. The cubic root of 981531853 is about 993.8056603820.

The spelling of 981531853 in words is "nine hundred eighty-one million, five hundred thirty-one thousand, eight hundred fifty-three".