253522499981 has 2 divisors, whose sum is σ = 253522499982. Its totient is φ = 253522499980.

The previous prime is 253522499941. The next prime is 253522500001. The reversal of 253522499981 is 189994225352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 238860922756 + 14661577225 = 488734^2 + 121085^2 .

It is a cyclic number.

It is not a de Polignac number, because 253522499981 - 2¹⁴ = 253522483597 is a prime.

It is a super-2 number, since 2×253522499981² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 253522499981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253522499941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126761249990 + 126761249991.

It is an arithmetic number, because the mean of its divisors is an integer number (126761249991).

Almost surely, 2^253522499981 is an apocalyptic number.

It is an amenable number.

253522499981 is a deficient number, since it is larger than the sum of its proper divisors (1).

253522499981 is an equidigital number, since it uses as much as digits as its factorization.

253522499981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13996800, while the sum is 59.

The spelling of 253522499981 in words is "two hundred fifty-three billion, five hundred twenty-two million, four hundred ninety-nine thousand, nine hundred eighty-one".