86967821 has 2 divisors, whose sum is σ = 86967822. Its totient is φ = 86967820.

The previous prime is 86967787. The next prime is 86967827. The reversal of 86967821 is 12876968.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51696100 + 35271721 = 7190^2 + 5939^2 .

It is a cyclic number.

It is not a de Polignac number, because 86967821 - 2¹⁰ = 86966797 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 (86967827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43483910 + 43483911.

It is an arithmetic number, because the mean of its divisors is an integer number (43483911).

Almost surely, 2^86967821 is an apocalyptic number.

It is an amenable number.

86967821 is a deficient number, since it is larger than the sum of its proper divisors (1).

86967821 is an equidigital number, since it uses as much as digits as its factorization.

86967821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 47.

The square root of 86967821 is about 9325.6539180907. The cubic root of 86967821 is about 443.0501245200.

The spelling of 86967821 in words is "eighty-six million, nine hundred sixty-seven thousand, eight hundred twenty-one".