87020939 has 2 divisors, whose sum is σ = 87020940. Its totient is φ = 87020938.

The previous prime is 87020933. The next prime is 87020963. The reversal of 87020939 is 93902078.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87020939 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87020933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43510469 + 43510470.

It is an arithmetic number, because the mean of its divisors is an integer number (43510470).

Almost surely, 2^87020939 is an apocalyptic number.

87020939 is a deficient number, since it is larger than the sum of its proper divisors (1).

87020939 is an equidigital number, since it uses as much as digits as its factorization.

87020939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 87020939 is about 9328.5014337781. The cubic root of 87020939 is about 443.1403078642.

The spelling of 87020939 in words is "eighty-seven million, twenty thousand, nine hundred thirty-nine".