245128669 has 4 divisors (see below), whose sum is σ = 247058944. Its totient is φ = 243198396.

The previous prime is 245128649. The next prime is 245128673. The reversal of 245128669 is 966821542.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 966821542 = 2 ⋅483410771.

It is not a de Polignac number, because 245128669 - 2⁹ = 245128157 is a prime.

It is a super-2 number, since 2×245128669² = 120176128731423122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245128649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 964947 + ... + 965200.

It is an arithmetic number, because the mean of its divisors is an integer number (61764736).

Almost surely, 2^245128669 is an apocalyptic number.

It is an amenable number.

245128669 is a deficient number, since it is larger than the sum of its proper divisors (1930275).

245128669 is a wasteful number, since it uses less digits than its factorization.

245128669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1930274.

The product of its digits is 207360, while the sum is 43.

The square root of 245128669 is about 15656.5854834316. The cubic root of 245128669 is about 625.8419960389.

The spelling of 245128669 in words is "two hundred forty-five million, one hundred twenty-eight thousand, six hundred sixty-nine".