42817409989 has 4 divisors (see below), whose sum is σ = 43974637324. Its totient is φ = 41660182656.

The previous prime is 42817409959. The next prime is 42817410173. The reversal of 42817409989 is 98990471824.

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 27604161025 + 15213248964 = 166145^2 + 123342^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42817409989 is a prime.

It is a super-4 number, since 4×42817409989⁴ (a number of 44 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42817409959) 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, 578613612 + ... + 578613685.

It is an arithmetic number, because the mean of its divisors is an integer number (10993659331).

Almost surely, 2^42817409989 is an apocalyptic number.

It is an amenable number.

42817409989 is a deficient number, since it is larger than the sum of its proper divisors (1157227335).

42817409989 is a wasteful number, since it uses less digits than its factorization.

42817409989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157227334.

The product of its (nonzero) digits is 10450944, while the sum is 61.

The spelling of 42817409989 in words is "forty-two billion, eight hundred seventeen million, four hundred nine thousand, nine hundred eighty-nine".