84971901 has 16 divisors (see below), whose sum is σ = 129729024. Its totient is φ = 48462384.

The previous prime is 84971897. The next prime is 84971923. The reversal of 84971901 is 10917948.

It is a happy number.

It is not a de Polignac number, because 84971901 - 2² = 84971897 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 84971901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84971501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8230 + ... + 15416.

It is an arithmetic number, because the mean of its divisors is an integer number (8108064).

Almost surely, 2^84971901 is an apocalyptic number.

It is an amenable number.

84971901 is a deficient number, since it is larger than the sum of its proper divisors (44757123).

84971901 is a wasteful number, since it uses less digits than its factorization.

84971901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7760.

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 84971901 is about 9218.0204490986. The cubic root of 84971901 is about 439.6345122616.

The spelling of 84971901 in words is "eighty-four million, nine hundred seventy-one thousand, nine hundred one".