245520397 has 2 divisors, whose sum is σ = 245520398. Its totient is φ = 245520396.

The previous prime is 245520371. The next prime is 245520421. The reversal of 245520397 is 793025542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 234886276 + 10634121 = 15326^2 + 3261^2 .

It is a cyclic number.

It is not a de Polignac number, because 245520397 - 2⁷ = 245520269 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245520347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122760198 + 122760199.

It is an arithmetic number, because the mean of its divisors is an integer number (122760199).

Almost surely, 2^245520397 is an apocalyptic number.

It is an amenable number.

245520397 is a deficient number, since it is larger than the sum of its proper divisors (1).

245520397 is an equidigital number, since it uses as much as digits as its factorization.

245520397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 37.

The square root of 245520397 is about 15669.0904968987. The cubic root of 245520397 is about 626.1751943243.

The spelling of 245520397 in words is "two hundred forty-five million, five hundred twenty thousand, three hundred ninety-seven".