245686421 has 2 divisors, whose sum is σ = 245686422. Its totient is φ = 245686420.

The previous prime is 245686411. The next prime is 245686433. The reversal of 245686421 is 124686542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171898321 + 73788100 = 13111^2 + 8590^2 .

It is a cyclic number.

It is not a de Polignac number, because 245686421 - 2¹⁰ = 245685397 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 (245686411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122843210 + 122843211.

It is an arithmetic number, because the mean of its divisors is an integer number (122843211).

Almost surely, 2^245686421 is an apocalyptic number.

It is an amenable number.

245686421 is a deficient number, since it is larger than the sum of its proper divisors (1).

245686421 is an equidigital number, since it uses as much as digits as its factorization.

245686421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 92160, while the sum is 38.

The square root of 245686421 is about 15674.3874202471. The cubic root of 245686421 is about 626.3163050527.

The spelling of 245686421 in words is "two hundred forty-five million, six hundred eighty-six thousand, four hundred twenty-one".