87181333 has 2 divisors, whose sum is σ = 87181334. Its totient is φ = 87181332.

The previous prime is 87181307. The next prime is 87181373. The reversal of 87181333 is 33318178.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87179569 + 1764 = 9337^2 + 42^2 .

It is a cyclic number.

It is not a de Polignac number, because 87181333 - 2⁵ = 87181301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87181373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43590666 + 43590667.

It is an arithmetic number, because the mean of its divisors is an integer number (43590667).

Almost surely, 2^87181333 is an apocalyptic number.

It is an amenable number.

87181333 is a deficient number, since it is larger than the sum of its proper divisors (1).

87181333 is an equidigital number, since it uses as much as digits as its factorization.

87181333 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 34.

The square root of 87181333 is about 9337.0944624117. The cubic root of 87181333 is about 443.4124010834.

The spelling of 87181333 in words is "eighty-seven million, one hundred eighty-one thousand, three hundred thirty-three".