2254399981 has 2 divisors, whose sum is σ = 2254399982. Its totient is φ = 2254399980.

The previous prime is 2254399963. The next prime is 2254400033. The reversal of 2254399981 is 1899934522.

It is an a-pointer prime, because the next prime (2254400033) can be obtained adding 2254399981 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1608731881 + 645668100 = 40109^2 + 25410^2 .

It is a cyclic number.

It is not a de Polignac number, because 2254399981 - 2¹¹ = 2254397933 is a prime.

It is a super-2 number, since 2×2254399981² = 10164638548665600722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2254399181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1127199990 + 1127199991.

It is an arithmetic number, because the mean of its divisors is an integer number (1127199991).

Almost surely, 2^2254399981 is an apocalyptic number.

It is an amenable number.

2254399981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2254399981 is an equidigital number, since it uses as much as digits as its factorization.

2254399981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 52.

The square root of 2254399981 is about 47480.5221222345. The cubic root of 2254399981 is about 1311.2243047997.

The spelling of 2254399981 in words is "two billion, two hundred fifty-four million, three hundred ninety-nine thousand, nine hundred eighty-one".