44639125381 has 2 divisors, whose sum is σ = 44639125382. Its totient is φ = 44639125380.

The previous prime is 44639125327. The next prime is 44639125409. The reversal of 44639125381 is 18352193644.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27096122881 + 17543002500 = 164609^2 + 132450^2 .

It is a cyclic number.

It is not a de Polignac number, because 44639125381 - 2²¹ = 44637028229 is a prime.

It is a super-2 number, since 2×44639125381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (44639125681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22319562690 + 22319562691.

It is an arithmetic number, because the mean of its divisors is an integer number (22319562691).

Almost surely, 2^44639125381 is an apocalyptic number.

It is an amenable number.

44639125381 is a deficient number, since it is larger than the sum of its proper divisors (1).

44639125381 is an equidigital number, since it uses as much as digits as its factorization.

44639125381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 46.

The spelling of 44639125381 in words is "forty-four billion, six hundred thirty-nine million, one hundred twenty-five thousand, three hundred eighty-one".