245550421 has 2 divisors, whose sum is σ = 245550422. Its totient is φ = 245550420.

The previous prime is 245550401. The next prime is 245550449. The reversal of 245550421 is 124055542.

It is an a-pointer prime, because the next prime (245550449) can be obtained adding 245550421 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 245548900 + 1521 = 15670^2 + 39^2 .

It is a cyclic number.

It is not a de Polignac number, because 245550421 - 2²¹ = 243453269 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 245550421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245550401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122775210 + 122775211.

It is an arithmetic number, because the mean of its divisors is an integer number (122775211).

Almost surely, 2^245550421 is an apocalyptic number.

It is an amenable number.

245550421 is a deficient number, since it is larger than the sum of its proper divisors (1).

245550421 is an equidigital number, since it uses as much as digits as its factorization.

245550421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8000, while the sum is 28.

The square root of 245550421 is about 15670.0485321520. The cubic root of 245550421 is about 626.2007176861.

The spelling of 245550421 in words is "two hundred forty-five million, five hundred fifty thousand, four hundred twenty-one".