99971039 has 4 divisors (see below), whose sum is σ = 114252624. Its totient is φ = 85689456.

The previous prime is 99971023. The next prime is 99971051. The reversal of 99971039 is 93017999.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93017999 = 17 ⋅5471647.

It is a cyclic number.

It is not a de Polignac number, because 99971039 - 2⁴ = 99971023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 99970984 and 99971002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99971099) 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, 7140782 + ... + 7140795.

It is an arithmetic number, because the mean of its divisors is an integer number (28563156).

Almost surely, 2^99971039 is an apocalyptic number.

99971039 is a deficient number, since it is larger than the sum of its proper divisors (14281585).

99971039 is a wasteful number, since it uses less digits than its factorization.

99971039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14281584.

The product of its (nonzero) digits is 137781, while the sum is 47.

The square root of 99971039 is about 9998.5518451424. The cubic root of 99971039 is about 464.1140706835.

The spelling of 99971039 in words is "ninety-nine million, nine hundred seventy-one thousand, thirty-nine".