253533914581 has 2 divisors, whose sum is σ = 253533914582. Its totient is φ = 253533914580.

The previous prime is 253533914573. The next prime is 253533914657. The reversal of 253533914581 is 185419335352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132401376900 + 121132537681 = 363870^2 + 348041^2 .

It is a cyclic number.

It is not a de Polignac number, because 253533914581 - 2³ = 253533914573 is a prime.

It is a super-2 number, since 2×253533914581² (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 (253533914531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126766957290 + 126766957291.

It is an arithmetic number, because the mean of its divisors is an integer number (126766957291).

Almost surely, 2^253533914581 is an apocalyptic number.

It is an amenable number.

253533914581 is a deficient number, since it is larger than the sum of its proper divisors (1).

253533914581 is an equidigital number, since it uses as much as digits as its factorization.

253533914581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944000, while the sum is 49.

The spelling of 253533914581 in words is "two hundred fifty-three billion, five hundred thirty-three million, nine hundred fourteen thousand, five hundred eighty-one".