245420101 has 4 divisors (see below), whose sum is σ = 245484652. Its totient is φ = 245355552.

The previous prime is 245420089. The next prime is 245420111. The reversal of 245420101 is 101024542.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 101024542 = 2 ⋅50512271.

It can be written as a sum of positive squares in 2 ways, for example, as 180230625 + 65189476 = 13425^2 + 8074^2 .

It is a cyclic number.

It is not a de Polignac number, because 245420101 - 2²⁵ = 211865669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245420111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26190 + ... + 34303.

It is an arithmetic number, because the mean of its divisors is an integer number (61371163).

Almost surely, 2^245420101 is an apocalyptic number.

It is an amenable number.

245420101 is a deficient number, since it is larger than the sum of its proper divisors (64551).

245420101 is an equidigital number, since it uses as much as digits as its factorization.

245420101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64550.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 245420101 is about 15665.8897289621. The cubic root of 245420101 is about 626.0899177421.

Adding to 245420101 its reverse (101024542), we get a palindrome (346444643).

The spelling of 245420101 in words is "two hundred forty-five million, four hundred twenty thousand, one hundred one".