87971633 has 2 divisors, whose sum is σ = 87971634. Its totient is φ = 87971632.

The previous prime is 87971591. The next prime is 87971657. The reversal of 87971633 is 33617978.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81504784 + 6466849 = 9028^2 + 2543^2 .

It is a cyclic number.

It is not a de Polignac number, because 87971633 - 2¹⁰ = 87970609 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (87971693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43985816 + 43985817.

It is an arithmetic number, because the mean of its divisors is an integer number (43985817).

Almost surely, 2^87971633 is an apocalyptic number.

It is an amenable number.

87971633 is a deficient number, since it is larger than the sum of its proper divisors (1).

87971633 is an equidigital number, since it uses as much as digits as its factorization.

87971633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 44.

The square root of 87971633 is about 9379.3194316006. The cubic root of 87971633 is about 444.7482193084.

The spelling of 87971633 in words is "eighty-seven million, nine hundred seventy-one thousand, six hundred thirty-three".