988289657 has 2 divisors, whose sum is σ = 988289658. Its totient is φ = 988289656.

The previous prime is 988289651. The next prime is 988289677. The reversal of 988289657 is 756982889.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 973689616 + 14600041 = 31204^2 + 3821^2 .

It is a cyclic number.

It is not a de Polignac number, because 988289657 - 2¹⁶ = 988224121 is a prime.

It is a super-2 number, since 2×988289657² = 1953432892266355298, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 988289657.

It is not a weakly prime, because it can be changed into another prime (988289651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494144828 + 494144829.

It is an arithmetic number, because the mean of its divisors is an integer number (494144829).

Almost surely, 2^988289657 is an apocalyptic number.

It is an amenable number.

988289657 is a deficient number, since it is larger than the sum of its proper divisors (1).

988289657 is an equidigital number, since it uses as much as digits as its factorization.

988289657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17418240, while the sum is 62.

The square root of 988289657 is about 31437.0745617336. The cubic root of 988289657 is about 996.0812155216.

The spelling of 988289657 in words is "nine hundred eighty-eight million, two hundred eighty-nine thousand, six hundred fifty-seven".