87160421 has 2 divisors, whose sum is σ = 87160422. Its totient is φ = 87160420.

The previous prime is 87160387. The next prime is 87160439. The reversal of 87160421 is 12406178.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75864100 + 11296321 = 8710^2 + 3361^2 .

It is a cyclic number.

It is not a de Polignac number, because 87160421 - 2⁶ = 87160357 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87160471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43580210 + 43580211.

It is an arithmetic number, because the mean of its divisors is an integer number (43580211).

Almost surely, 2^87160421 is an apocalyptic number.

It is an amenable number.

87160421 is a deficient number, since it is larger than the sum of its proper divisors (1).

87160421 is an equidigital number, since it uses as much as digits as its factorization.

87160421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 87160421 is about 9335.9745608051. The cubic root of 87160421 is about 443.3769447867.

Adding to 87160421 its reverse (12406178), we get a palindrome (99566599).

The spelling of 87160421 in words is "eighty-seven million, one hundred sixty thousand, four hundred twenty-one".