43861000031 has 2 divisors, whose sum is σ = 43861000032. Its totient is φ = 43861000030.

The previous prime is 43861000019. The next prime is 43861000037. The reversal of 43861000031 is 13000016834.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43861000031 is a prime.

It is a super-2 number, since 2×43861000031² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43861000037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21930500015 + 21930500016.

It is an arithmetic number, because the mean of its divisors is an integer number (21930500016).

Almost surely, 2^43861000031 is an apocalyptic number.

43861000031 is a deficient number, since it is larger than the sum of its proper divisors (1).

43861000031 is an equidigital number, since it uses as much as digits as its factorization.

43861000031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 43861000031 its reverse (13000016834), we get a palindrome (56861016865).

The spelling of 43861000031 in words is "forty-three billion, eight hundred sixty-one million, thirty-one", and thus it is an aban number.