87109973 has 2 divisors, whose sum is σ = 87109974. Its totient is φ = 87109972.

The previous prime is 87109961. The next prime is 87109991. The reversal of 87109973 is 37990178.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83137924 + 3972049 = 9118^2 + 1993^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87109973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87109933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43554986 + 43554987.

It is an arithmetic number, because the mean of its divisors is an integer number (43554987).

Almost surely, 2^87109973 is an apocalyptic number.

It is an amenable number.

87109973 is a deficient number, since it is larger than the sum of its proper divisors (1).

87109973 is an equidigital number, since it uses as much as digits as its factorization.

87109973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 87109973 is about 9333.2723628961. The cubic root of 87109973 is about 443.2913868517.

The spelling of 87109973 in words is "eighty-seven million, one hundred nine thousand, nine hundred seventy-three".