86971637 has 2 divisors, whose sum is σ = 86971638. Its totient is φ = 86971636.

The previous prime is 86971631. The next prime is 86971639. The reversal of 86971637 is 73617968.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49688401 + 37283236 = 7049^2 + 6106^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86971637 is a prime.

Together with 86971639, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 86971591 and 86971600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86971631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43485818 + 43485819.

It is an arithmetic number, because the mean of its divisors is an integer number (43485819).

Almost surely, 2^86971637 is an apocalyptic number.

It is an amenable number.

86971637 is a deficient number, since it is larger than the sum of its proper divisors (1).

86971637 is an equidigital number, since it uses as much as digits as its factorization.

86971637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 47.

The square root of 86971637 is about 9325.8585127590. The cubic root of 86971637 is about 443.0566045205.

The spelling of 86971637 in words is "eighty-six million, nine hundred seventy-one thousand, six hundred thirty-seven".