87421169 has 6 divisors (see below), whose sum is σ = 96091170. Its totient is φ = 79473680.

The previous prime is 87421151. The next prime is 87421171. The reversal of 87421169 is 96112478.

It can be written as a sum of positive squares in only one way, i.e., 86397025 + 1024144 = 9295^2 + 1012^2 .

It is a de Polignac number, because none of the positive numbers 2^k-87421169 is a prime.

It is a super-2 number, since 2×87421169² = 15284921578653122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87421189) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 361124 + ... + 361365.

It is an arithmetic number, because the mean of its divisors is an integer number (16015195).

Almost surely, 2^87421169 is an apocalyptic number.

It is an amenable number.

87421169 is a deficient number, since it is larger than the sum of its proper divisors (8670001).

87421169 is a wasteful number, since it uses less digits than its factorization.

87421169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722511 (or 722500 counting only the distinct ones).

The product of its digits is 24192, while the sum is 38.

The square root of 87421169 is about 9349.9288232585. The cubic root of 87421169 is about 443.8186382222.

The spelling of 87421169 in words is "eighty-seven million, four hundred twenty-one thousand, one hundred sixty-nine".