87127121 has 4 divisors (see below), whose sum is σ = 87167412. Its totient is φ = 87086832.

The previous prime is 87127111. The next prime is 87127123. The reversal of 87127121 is 12172178.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 59459521 + 27667600 = 7711^2 + 5260^2 .

It is a cyclic number.

It is not a de Polignac number, because 87127121 - 2¹⁰ = 87126097 is a prime.

It is a super-2 number, since 2×87127121² = 15182270427497282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87127123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16706 + ... + 21291.

It is an arithmetic number, because the mean of its divisors is an integer number (21791853).

Almost surely, 2^87127121 is an apocalyptic number.

It is an amenable number.

87127121 is a deficient number, since it is larger than the sum of its proper divisors (40291).

87127121 is a wasteful number, since it uses less digits than its factorization.

87127121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40290.

The product of its digits is 1568, while the sum is 29.

The square root of 87127121 is about 9334.1909665487. The cubic root of 87127121 is about 443.3204729280.

Adding to 87127121 its reverse (12172178), we get a palindrome (99299299).

The spelling of 87127121 in words is "eighty-seven million, one hundred twenty-seven thousand, one hundred twenty-one".