245444557 has 2 divisors, whose sum is σ = 245444558. Its totient is φ = 245444556.

The previous prime is 245444539. The next prime is 245444567. The reversal of 245444557 is 755444542.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 227074761 + 18369796 = 15069^2 + 4286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245444557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245444567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122722278 + 122722279.

It is an arithmetic number, because the mean of its divisors is an integer number (122722279).

Almost surely, 2^245444557 is an apocalyptic number.

It is an amenable number.

245444557 is a deficient number, since it is larger than the sum of its proper divisors (1).

245444557 is an equidigital number, since it uses as much as digits as its factorization.

245444557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 448000, while the sum is 40.

The square root of 245444557 is about 15666.6702588648. The cubic root of 245444557 is about 626.1107135753.

The spelling of 245444557 in words is "two hundred forty-five million, four hundred forty-four thousand, five hundred fifty-seven".