31561632043 has 4 divisors (see below), whose sum is σ = 31612620760. Its totient is φ = 31510643328.

The previous prime is 31561632019. The next prime is 31561632097. The reversal of 31561632043 is 34023616513.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34023616513 = 11801 ⋅2883113.

It is a cyclic number.

It is not a de Polignac number, because 31561632043 - 2¹³ = 31561623851 is a prime.

It is a super-2 number, since 2×31561632043² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31561662043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25493430 + ... + 25494667.

It is an arithmetic number, because the mean of its divisors is an integer number (7903155190).

Almost surely, 2^31561632043 is an apocalyptic number.

31561632043 is a deficient number, since it is larger than the sum of its proper divisors (50988717).

31561632043 is an equidigital number, since it uses as much as digits as its factorization.

31561632043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50988716.

The product of its (nonzero) digits is 38880, while the sum is 34.

The spelling of 31561632043 in words is "thirty-one billion, five hundred sixty-one million, six hundred thirty-two thousand, forty-three".