87938537213 has 2 divisors, whose sum is σ = 87938537214. Its totient is φ = 87938537212.

The previous prime is 87938537207. The next prime is 87938537257. The reversal of 87938537213 is 31273583978.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84217781209 + 3720756004 = 290203^2 + 60998^2 .

It is a cyclic number.

It is not a de Polignac number, because 87938537213 - 2⁶ = 87938537149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87938537513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43969268606 + 43969268607.

It is an arithmetic number, because the mean of its divisors is an integer number (43969268607).

Almost surely, 2^87938537213 is an apocalyptic number.

It is an amenable number.

87938537213 is a deficient number, since it is larger than the sum of its proper divisors (1).

87938537213 is an equidigital number, since it uses as much as digits as its factorization.

87938537213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7620480, while the sum is 56.

The spelling of 87938537213 in words is "eighty-seven billion, nine hundred thirty-eight million, five hundred thirty-seven thousand, two hundred thirteen".