245659681 has 2 divisors, whose sum is σ = 245659682. Its totient is φ = 245659680.

The previous prime is 245659643. The next prime is 245659693. The reversal of 245659681 is 186956542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184960000 + 60699681 = 13600^2 + 7791^2 .

It is a cyclic number.

It is not a de Polignac number, because 245659681 - 2¹⁷ = 245528609 is a prime.

It is a super-2 number, since 2×245659681² = 120697357738043522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (245659781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122829840 + 122829841.

It is an arithmetic number, because the mean of its divisors is an integer number (122829841).

Almost surely, 2^245659681 is an apocalyptic number.

It is an amenable number.

245659681 is a deficient number, since it is larger than the sum of its proper divisors (1).

245659681 is an equidigital number, since it uses as much as digits as its factorization.

245659681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518400, while the sum is 46.

The square root of 245659681 is about 15673.5344131437. The cubic root of 245659681 is about 626.2935819062.

The spelling of 245659681 in words is "two hundred forty-five million, six hundred fifty-nine thousand, six hundred eighty-one".