71839098997 has 4 divisors (see below), whose sum is σ = 71916429420. Its totient is φ = 71761768576.

The previous prime is 71839098977. The next prime is 71839099061. The reversal of 71839098997 is 79989093817.

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

It can be written as a sum of positive squares in 2 ways, for example, as 36492842961 + 35346256036 = 191031^2 + 188006^2 .

It is a cyclic number.

It is not a de Polignac number, because 71839098997 - 2¹¹ = 71839096949 is a prime.

It is a super-2 number, since 2×71839098997² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71839098977) 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, 38663818 + ... + 38665675.

It is an arithmetic number, because the mean of its divisors is an integer number (17979107355).

Almost surely, 2^71839098997 is an apocalyptic number.

It is an amenable number.

71839098997 is a deficient number, since it is larger than the sum of its proper divisors (77330423).

71839098997 is an equidigital number, since it uses as much as digits as its factorization.

71839098997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77330422.

The product of its (nonzero) digits is 61725888, while the sum is 70.

The spelling of 71839098997 in words is "seventy-one billion, eight hundred thirty-nine million, ninety-eight thousand, nine hundred ninety-seven".