981886551 has 4 divisors (see below), whose sum is σ = 1309182072. Its totient is φ = 654591032.

The previous prime is 981886547. The next prime is 981886559. The reversal of 981886551 is 155688189.

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 981886551 - 2² = 981886547 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 981886494 and 981886503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981886559) 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, 163647756 + ... + 163647761.

It is an arithmetic number, because the mean of its divisors is an integer number (327295518).

Almost surely, 2^981886551 is an apocalyptic number.

981886551 is a deficient number, since it is larger than the sum of its proper divisors (327295521).

981886551 is a wasteful number, since it uses less digits than its factorization.

981886551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327295520.

The product of its digits is 691200, while the sum is 51.

The square root of 981886551 is about 31335.0690281671. The cubic root of 981886551 is about 993.9253571010.

It can be divided in two parts, 9818 and 86551, that added together give a palindrome (96369).

The spelling of 981886551 in words is "nine hundred eighty-one million, eight hundred eighty-six thousand, five hundred fifty-one".