42956209731 has 16 divisors (see below), whose sum is σ = 58023225344. Its totient is φ = 28264944384.

The previous prime is 42956209697. The next prime is 42956209759. The reversal of 42956209731 is 13790265924.

It is not a de Polignac number, because 42956209731 - 2¹⁰ = 42956208707 is a prime.

It is a super-2 number, since 2×42956209731² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42956207731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94315 + ... + 307908.

It is an arithmetic number, because the mean of its divisors is an integer number (3626451584).

Almost surely, 2^42956209731 is an apocalyptic number.

42956209731 is a deficient number, since it is larger than the sum of its proper divisors (15067015613).

42956209731 is a wasteful number, since it uses less digits than its factorization.

42956209731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402690.

The product of its (nonzero) digits is 816480, while the sum is 48.

The spelling of 42956209731 in words is "forty-two billion, nine hundred fifty-six million, two hundred nine thousand, seven hundred thirty-one".