87121196569 has 9 divisors (see below), whose sum is σ = 95764884159. Its totient is φ = 79198136160.

The previous prime is 87121196551. The next prime is 87121196579. The reversal of 87121196569 is 96569112178.

It is a happy number.

The square root of 87121196569 is 295163.

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

It can be written as a sum of positive squares in only one way, i.e., 7773067225 + 79348129344 = 88165^2 + 281688^2 .

It is not a de Polignac number, because 87121196569 - 2⁵ = 87121196537 is a prime.

It is a super-2 number, since 2×87121196569² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87121196579) 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, 3233377 + ... + 3260209.

Almost surely, 2^87121196569 is an apocalyptic number.

87121196569 is the 295163-rd square number.

87121196569 is the 147582-nd centered octagonal number.

It is an amenable number.

87121196569 is a deficient number, since it is larger than the sum of its proper divisors (8643687590).

87121196569 is an frugal number, since it uses more digits than its factorization.

87121196569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53688 (or 26844 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 55.

The spelling of 87121196569 in words is "eighty-seven billion, one hundred twenty-one million, one hundred ninety-six thousand, five hundred sixty-nine".