63172971 has 6 divisors (see below), whose sum is σ = 91249860. Its totient is φ = 42115308.

The previous prime is 63172957. The next prime is 63172981. The reversal of 63172971 is 17927136.

It is a happy number.

It is not a de Polignac number, because 63172971 - 2¹³ = 63164779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63172931) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3509601 + ... + 3509618.

It is an arithmetic number, because the mean of its divisors is an integer number (15208310).

Almost surely, 2^63172971 is an apocalyptic number.

63172971 is a deficient number, since it is larger than the sum of its proper divisors (28076889).

63172971 is a wasteful number, since it uses less digits than its factorization.

63172971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7019225 (or 7019222 counting only the distinct ones).

The product of its digits is 15876, while the sum is 36.

The square root of 63172971 is about 7948.1426132147. The cubic root of 63172971 is about 398.2695475478.

The spelling of 63172971 in words is "sixty-three million, one hundred seventy-two thousand, nine hundred seventy-one".