43981626251 has 2 divisors, whose sum is σ = 43981626252. Its totient is φ = 43981626250.

The previous prime is 43981626223. The next prime is 43981626253. The reversal of 43981626251 is 15262618934.

43981626251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43981626251 - 2¹⁰ = 43981625227 is a prime.

Together with 43981626253, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 43981626196 and 43981626205.

It is not a weakly prime, because it can be changed into another prime (43981626253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21990813125 + 21990813126.

It is an arithmetic number, because the mean of its divisors is an integer number (21990813126).

Almost surely, 2^43981626251 is an apocalyptic number.

43981626251 is a deficient number, since it is larger than the sum of its proper divisors (1).

43981626251 is an equidigital number, since it uses as much as digits as its factorization.

43981626251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 47.

The spelling of 43981626251 in words is "forty-three billion, nine hundred eighty-one million, six hundred twenty-six thousand, two hundred fifty-one".