97971439 has 4 divisors (see below), whose sum is σ = 101131840. Its totient is φ = 94811040.

The previous prime is 97971407. The next prime is 97971443. The reversal of 97971439 is 93417979.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 97971439 - 2⁵ = 97971407 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 97971392 and 97971401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97971469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1580154 + ... + 1580215.

It is an arithmetic number, because the mean of its divisors is an integer number (25282960).

Almost surely, 2^97971439 is an apocalyptic number.

97971439 is a deficient number, since it is larger than the sum of its proper divisors (3160401).

97971439 is a wasteful number, since it uses less digits than its factorization.

97971439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3160400.

The product of its digits is 428652, while the sum is 49.

The square root of 97971439 is about 9898.0522831515. The cubic root of 97971439 is about 460.9988361905.

It can be divided in two parts, 9797 and 1439, that added together give a square (11236 = 106²).

The spelling of 97971439 in words is "ninety-seven million, nine hundred seventy-one thousand, four hundred thirty-nine".