63691671 has 4 divisors (see below), whose sum is σ = 84922232. Its totient is φ = 42461112.

The previous prime is 63691657. The next prime is 63691687. The reversal of 63691671 is 17619636.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 63691671 - 2¹⁷ = 63560599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63698671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10615276 + ... + 10615281.

It is an arithmetic number, because the mean of its divisors is an integer number (21230558).

Almost surely, 2^63691671 is an apocalyptic number.

63691671 is a deficient number, since it is larger than the sum of its proper divisors (21230561).

63691671 is a wasteful number, since it uses less digits than its factorization.

63691671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21230560.

The product of its digits is 40824, while the sum is 39.

The square root of 63691671 is about 7980.7061717620. The cubic root of 63691671 is about 399.3566136064.

The spelling of 63691671 in words is "sixty-three million, six hundred ninety-one thousand, six hundred seventy-one".