87760121 has 2 divisors, whose sum is σ = 87760122. Its totient is φ = 87760120.

The previous prime is 87760097. The next prime is 87760147. The reversal of 87760121 is 12106778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87684496 + 75625 = 9364^2 + 275^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87760121 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (87760181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43880060 + 43880061.

It is an arithmetic number, because the mean of its divisors is an integer number (43880061).

Almost surely, 2^87760121 is an apocalyptic number.

It is an amenable number.

87760121 is a deficient number, since it is larger than the sum of its proper divisors (1).

87760121 is an equidigital number, since it uses as much as digits as its factorization.

87760121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 87760121 is about 9368.0372010363. The cubic root of 87760121 is about 444.3914941757.

Adding to 87760121 its reverse (12106778), we get a palindrome (99866899).

The spelling of 87760121 in words is "eighty-seven million, seven hundred sixty thousand, one hundred twenty-one".