43137789621 has 8 divisors (see below), whose sum is σ = 57518062464. Its totient is φ = 28758021600.

The previous prime is 43137789613. The next prime is 43137789647. The reversal of 43137789621 is 12698773134.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 43137789621 - 2³ = 43137789613 is a prime.

It is a super-3 number, since 3×43137789621³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43137789421) 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 7 ways as a sum of consecutive naturals, for example, 177796 + ... + 343346.

It is an arithmetic number, because the mean of its divisors is an integer number (7189757808).

Almost surely, 2^43137789621 is an apocalyptic number.

It is an amenable number.

43137789621 is a deficient number, since it is larger than the sum of its proper divisors (14380272843).

43137789621 is a wasteful number, since it uses less digits than its factorization.

43137789621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252411.

The product of its digits is 1524096, while the sum is 51.

The spelling of 43137789621 in words is "forty-three billion, one hundred thirty-seven million, seven hundred eighty-nine thousand, six hundred twenty-one".