254221993 has 2 divisors, whose sum is σ = 254221994. Its totient is φ = 254221992.

The previous prime is 254221991. The next prime is 254221997. The reversal of 254221993 is 399122452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194128489 + 60093504 = 13933^2 + 7752^2 .

It is a cyclic number.

It is not a de Polignac number, because 254221993 - 2¹ = 254221991 is a prime.

Together with 254221991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (254221991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127110996 + 127110997.

It is an arithmetic number, because the mean of its divisors is an integer number (127110997).

Almost surely, 2^254221993 is an apocalyptic number.

It is an amenable number.

254221993 is a deficient number, since it is larger than the sum of its proper divisors (1).

254221993 is an equidigital number, since it uses as much as digits as its factorization.

254221993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 37.

The square root of 254221993 is about 15944.3404692700. The cubic root of 254221993 is about 633.4869990627.

The spelling of 254221993 in words is "two hundred fifty-four million, two hundred twenty-one thousand, nine hundred ninety-three".