43640613631 has 4 divisors (see below), whose sum is σ = 43644403264. Its totient is φ = 43636824000.

The previous prime is 43640613629. The next prime is 43640613641. The reversal of 43640613631 is 13631604634.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13631604634 = 2 ⋅6815802317.

It is a cyclic number.

It is not a de Polignac number, because 43640613631 - 2¹ = 43640613629 is a prime.

It is a super-2 number, since 2×43640613631² (a number of 22 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 (43640613641) 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, 1877490 + ... + 1900591.

It is an arithmetic number, because the mean of its divisors is an integer number (10911100816).

Almost surely, 2^43640613631 is an apocalyptic number.

43640613631 is a deficient number, since it is larger than the sum of its proper divisors (3789633).

43640613631 is a wasteful number, since it uses less digits than its factorization.

43640613631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3789632.

The product of its (nonzero) digits is 93312, while the sum is 37.

The spelling of 43640613631 in words is "forty-three billion, six hundred forty million, six hundred thirteen thousand, six hundred thirty-one".