43648191031 has 4 divisors (see below), whose sum is σ = 43648677352. Its totient is φ = 43647704712.

The previous prime is 43648191029. The next prime is 43648191061. The reversal of 43648191031 is 13019184634.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 13019184634 = 2 ⋅6509592317.

It is a cyclic number.

It is not a de Polignac number, because 43648191031 - 2¹ = 43648191029 is a prime.

It is a super-7 number, since 7×43648191031⁷ (a number of 76 digits) contains 7777777 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 (43648191011) 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, 65040 + ... + 302533.

It is an arithmetic number, because the mean of its divisors is an integer number (10912169338).

Almost surely, 2^43648191031 is an apocalyptic number.

43648191031 is a deficient number, since it is larger than the sum of its proper divisors (486321).

43648191031 is a wasteful number, since it uses less digits than its factorization.

43648191031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486320.

The product of its (nonzero) digits is 62208, while the sum is 40.

The spelling of 43648191031 in words is "forty-three billion, six hundred forty-eight million, one hundred ninety-one thousand, thirty-one".