987478169 has 2 divisors, whose sum is σ = 987478170. Its totient is φ = 987478168.

The previous prime is 987478147. The next prime is 987478183. The reversal of 987478169 is 961874789.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 793154569 + 194323600 = 28163^2 + 13940^2 .

It is a cyclic number.

It is not a de Polignac number, because 987478169 - 2²⁸ = 719042713 is a prime.

It is a super-2 number, since 2×987478169² = 1950226268503185122, which contains 22 as substring.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (987478109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493739084 + 493739085.

It is an arithmetic number, because the mean of its divisors is an integer number (493739085).

Almost surely, 2^987478169 is an apocalyptic number.

It is an amenable number.

987478169 is a deficient number, since it is larger than the sum of its proper divisors (1).

987478169 is an equidigital number, since it uses as much as digits as its factorization.

987478169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6096384, while the sum is 59.

The square root of 987478169 is about 31424.1653668001. The cubic root of 987478169 is about 995.8085123104.

The spelling of 987478169 in words is "nine hundred eighty-seven million, four hundred seventy-eight thousand, one hundred sixty-nine".