887117213161 has 9 divisors (see below), whose sum is σ = 895434196293. Its totient is φ = 878876801280.

The previous prime is 887117213153. The next prime is 887117213201. The reversal of 887117213161 is 161312711788.

887117213161 = T₁₇₈ + T₁₇₉ + ... + T₁₇₄₅₉.

It is a happy number.

The square root of 887117213161 is 941869.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 144452444761 + 742664768400 = 380069^2 + 861780^2 .

It is not a de Polignac number, because 887117213161 - 2³ = 887117213153 is a prime.

It is a super-2 number, since 2×887117213161² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (887117213461) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 102659401 + ... + 102668041.

It is an arithmetic number, because the mean of its divisors is an integer number (99492688477).

Almost surely, 2^887117213161 is an apocalyptic number.

887117213161 is the 941869-th square number.

887117213161 is the 470935-th centered octagonal number.

It is an amenable number.

887117213161 is a deficient number, since it is larger than the sum of its proper divisors (8316983132).

887117213161 is an frugal number, since it uses more digits than its factorization.

887117213161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17500 (or 8750 counting only the distinct ones).

The product of its digits is 112896, while the sum is 46.

The spelling of 887117213161 in words is "eight hundred eighty-seven billion, one hundred seventeen million, two hundred thirteen thousand, one hundred sixty-one".