989753881 has 2 divisors, whose sum is σ = 989753882. Its totient is φ = 989753880.

The previous prime is 989753873. The next prime is 989753893. The reversal of 989753881 is 188357989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 670810000 + 318943881 = 25900^2 + 17859^2 .

It is a cyclic number.

It is not a de Polignac number, because 989753881 - 2³ = 989753873 is a prime.

It is a super-2 number, since 2×989753881² = 1959225489909124322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (989753861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494876940 + 494876941.

It is an arithmetic number, because the mean of its divisors is an integer number (494876941).

Almost surely, 2^989753881 is an apocalyptic number.

It is an amenable number.

989753881 is a deficient number, since it is larger than the sum of its proper divisors (1).

989753881 is an equidigital number, since it uses as much as digits as its factorization.

989753881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 58.

The square root of 989753881 is about 31460.3541143452. The cubic root of 989753881 is about 996.5728953710.

The spelling of 989753881 in words is "nine hundred eighty-nine million, seven hundred fifty-three thousand, eight hundred eighty-one".