245408381 has 2 divisors, whose sum is σ = 245408382. Its totient is φ = 245408380.

The previous prime is 245408357. The next prime is 245408393. The reversal of 245408381 is 183804542.

245408381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209815225 + 35593156 = 14485^2 + 5966^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245408381 is a prime.

It is a super-2 number, since 2×245408381² = 120450546930082322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245408281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122704190 + 122704191.

It is an arithmetic number, because the mean of its divisors is an integer number (122704191).

Almost surely, 2^245408381 is an apocalyptic number.

It is an amenable number.

245408381 is a deficient number, since it is larger than the sum of its proper divisors (1).

245408381 is an equidigital number, since it uses as much as digits as its factorization.

245408381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30720, while the sum is 35.

The square root of 245408381 is about 15665.5156633926. The cubic root of 245408381 is about 626.0799513068.

The spelling of 245408381 in words is "two hundred forty-five million, four hundred eight thousand, three hundred eighty-one".