87834221 has 2 divisors, whose sum is σ = 87834222. Its totient is φ = 87834220.

The previous prime is 87834199. The next prime is 87834233. The reversal of 87834221 is 12243878.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52562500 + 35271721 = 7250^2 + 5939^2 .

It is a cyclic number.

It is not a de Polignac number, because 87834221 - 2¹⁸ = 87572077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87834821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43917110 + 43917111.

It is an arithmetic number, because the mean of its divisors is an integer number (43917111).

Almost surely, 2^87834221 is an apocalyptic number.

It is an amenable number.

87834221 is a deficient number, since it is larger than the sum of its proper divisors (1).

87834221 is an equidigital number, since it uses as much as digits as its factorization.

87834221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 35.

The square root of 87834221 is about 9371.9913038799. The cubic root of 87834221 is about 444.5165325406.

The spelling of 87834221 in words is "eighty-seven million, eight hundred thirty-four thousand, two hundred twenty-one".