1961844444381 has 32 divisors (see below), whose sum is σ = 2655710830080. Its totient is φ = 1288131989184.

The previous prime is 1961844444361. The next prime is 1961844444407. The reversal of 1961844444381 is 1834444481691.

It is not a de Polignac number, because 1961844444381 - 2²¹ = 1961842347229 is a prime.

It is a super-2 number, since 2×1961844444381² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961844444331) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25933510 + ... + 26009048.

It is an arithmetic number, because the mean of its divisors is an integer number (82990963440).

Almost surely, 2^{1961844444381} is an apocalyptic number.

It is an amenable number.

1961844444381 is a deficient number, since it is larger than the sum of its proper divisors (693866385699).

1961844444381 is a wasteful number, since it uses less digits than its factorization.

1961844444381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76185.

The product of its digits is 10616832, while the sum is 57.

The spelling of 1961844444381 in words is "one trillion, nine hundred sixty-one billion, eight hundred forty-four million, four hundred forty-four thousand, three hundred eighty-one".