87434861 has 2 divisors, whose sum is σ = 87434862. Its totient is φ = 87434860.

The previous prime is 87434857. The next prime is 87434863. The reversal of 87434861 is 16843478.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82919236 + 4515625 = 9106^2 + 2125^2 .

It is a cyclic number.

It is not a de Polignac number, because 87434861 - 2² = 87434857 is a prime.

Together with 87434863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87434863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43717430 + 43717431.

It is an arithmetic number, because the mean of its divisors is an integer number (43717431).

Almost surely, 2^87434861 is an apocalyptic number.

It is an amenable number.

87434861 is a deficient number, since it is larger than the sum of its proper divisors (1).

87434861 is an equidigital number, since it uses as much as digits as its factorization.

87434861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 41.

The square root of 87434861 is about 9350.6609926785. The cubic root of 87434861 is about 443.8418074676.

The spelling of 87434861 in words is "eighty-seven million, four hundred thirty-four thousand, eight hundred sixty-one".