981136421 has 16 divisors (see below), whose sum is σ = 1062927360. Its totient is φ = 902669040.

The previous prime is 981136361. The next prime is 981136427. The reversal of 981136421 is 124631189.

It is a cyclic number.

It is not a de Polignac number, because 981136421 - 2⁶ = 981136357 is a prime.

It is a super-2 number, since 2×981136421² = 1925257353225378482, 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 (981136427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112790 + ... + 121176.

It is an arithmetic number, because the mean of its divisors is an integer number (66432960).

Almost surely, 2^981136421 is an apocalyptic number.

It is an amenable number.

981136421 is a deficient number, since it is larger than the sum of its proper divisors (81790939).

981136421 is a wasteful number, since it uses less digits than its factorization.

981136421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8584.

The product of its digits is 10368, while the sum is 35.

The square root of 981136421 is about 31323.0972446851. The cubic root of 981136421 is about 993.6721835300.

The spelling of 981136421 in words is "nine hundred eighty-one million, one hundred thirty-six thousand, four hundred twenty-one".