87045121 has 2 divisors, whose sum is σ = 87045122. Its totient is φ = 87045120.

The previous prime is 87045073. The next prime is 87045131. The reversal of 87045121 is 12154078.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73273600 + 13771521 = 8560^2 + 3711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87045121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87045121.

It is not a weakly prime, because it can be changed into another prime (87045131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43522560 + 43522561.

It is an arithmetic number, because the mean of its divisors is an integer number (43522561).

Almost surely, 2^87045121 is an apocalyptic number.

It is an amenable number.

87045121 is a deficient number, since it is larger than the sum of its proper divisors (1).

87045121 is an equidigital number, since it uses as much as digits as its factorization.

87045121 is an evil number, because the sum of its binary digits is even.

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

The square root of 87045121 is about 9329.7974790453. The cubic root of 87045121 is about 443.1813517271.

Adding to 87045121 its reverse (12154078), we get a palindrome (99199199).

The spelling of 87045121 in words is "eighty-seven million, forty-five thousand, one hundred twenty-one".