51543444541 has 2 divisors, whose sum is σ = 51543444542. Its totient is φ = 51543444540.

The previous prime is 51543444523. The next prime is 51543444569. The reversal of 51543444541 is 14544434515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38854323225 + 12689121316 = 197115^2 + 112646^2 .

It is a cyclic number.

It is not a de Polignac number, because 51543444541 - 2¹¹ = 51543442493 is a prime.

It is a super-2 number, since 2×51543444541² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51543444494 and 51543444503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51543442541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25771722270 + 25771722271.

It is an arithmetic number, because the mean of its divisors is an integer number (25771722271).

Almost surely, 2^51543444541 is an apocalyptic number.

It is an amenable number.

51543444541 is a deficient number, since it is larger than the sum of its proper divisors (1).

51543444541 is an equidigital number, since it uses as much as digits as its factorization.

51543444541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384000, while the sum is 40.

The spelling of 51543444541 in words is "fifty-one billion, five hundred forty-three million, four hundred forty-four thousand, five hundred forty-one".