245021993 has 2 divisors, whose sum is σ = 245021994. Its totient is φ = 245021992.

The previous prime is 245021981. The next prime is 245022023. The reversal of 245021993 is 399120542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190660864 + 54361129 = 13808^2 + 7373^2 .

It is a cyclic number.

It is not a de Polignac number, because 245021993 - 2⁴ = 245021977 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (245021393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122510996 + 122510997.

It is an arithmetic number, because the mean of its divisors is an integer number (122510997).

Almost surely, 2^245021993 is an apocalyptic number.

It is an amenable number.

245021993 is a deficient number, since it is larger than the sum of its proper divisors (1).

245021993 is an equidigital number, since it uses as much as digits as its factorization.

245021993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 245021993 is about 15653.1783673476. The cubic root of 245021993 is about 625.7511974554.

The spelling of 245021993 in words is "two hundred forty-five million, twenty-one thousand, nine hundred ninety-three".