87405121 has 4 divisors (see below), whose sum is σ = 87592752. Its totient is φ = 87217492.

The previous prime is 87405113. The next prime is 87405127. The reversal of 87405121 is 12150478.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87405121 - 2³ = 87405113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87405121.

It is not an unprimeable number, because it can be changed into a prime (87405127) 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, 93115 + ... + 94048.

It is an arithmetic number, because the mean of its divisors is an integer number (21898188).

Almost surely, 2^87405121 is an apocalyptic number.

It is an amenable number.

87405121 is a deficient number, since it is larger than the sum of its proper divisors (187631).

87405121 is a wasteful number, since it uses less digits than its factorization.

87405121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187630.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 87405121 is about 9349.0705955191. The cubic root of 87405121 is about 443.7914791353.

Adding to 87405121 its reverse (12150478), we get a palindrome (99555599).

It can be divided in two parts, 8740 and 5121, that added together give a triangular number (13861 = T₁₆₆).

The spelling of 87405121 in words is "eighty-seven million, four hundred five thousand, one hundred twenty-one".