254443452581 has 2 divisors, whose sum is σ = 254443452582. Its totient is φ = 254443452580.

The previous prime is 254443452541. The next prime is 254443452619. The reversal of 254443452581 is 185254344452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216871833025 + 37571619556 = 465695^2 + 193834^2 .

It is a cyclic number.

It is not a de Polignac number, because 254443452581 - 2³⁰ = 253369710757 is a prime.

It is a super-2 number, since 2×254443452581² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (254443452541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127221726290 + 127221726291.

It is an arithmetic number, because the mean of its divisors is an integer number (127221726291).

Almost surely, 2^254443452581 is an apocalyptic number.

It is an amenable number.

254443452581 is a deficient number, since it is larger than the sum of its proper divisors (1).

254443452581 is an equidigital number, since it uses as much as digits as its factorization.

254443452581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3072000, while the sum is 47.

The spelling of 254443452581 in words is "two hundred fifty-four billion, four hundred forty-three million, four hundred fifty-two thousand, five hundred eighty-one".