245687945 has 4 divisors (see below), whose sum is σ = 294825540. Its totient is φ = 196550352.

The previous prime is 245687929. The next prime is 245687947. The reversal of 245687945 is 549786542.

245687945 = 11083² + 11084².

245687945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 122832889 + 122855056 = 11083^2 + 11084^2 .

It is a cyclic number.

It is not a de Polignac number, because 245687945 - 2⁴ = 245687929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 245687893 and 245687902.

It is not an unprimeable number, because it can be changed into a prime (245687947) 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, 24568790 + ... + 24568799.

It is an arithmetic number, because the mean of its divisors is an integer number (73706385).

Almost surely, 2^245687945 is an apocalyptic number.

245687945 is the 11084-th centered square number.

It is an amenable number.

245687945 is a deficient number, since it is larger than the sum of its proper divisors (49137595).

245687945 is an equidigital number, since it uses as much as digits as its factorization.

245687945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49137594.

The product of its digits is 2419200, while the sum is 50.

The square root of 245687945 is about 15674.4360345117. The cubic root of 245687945 is about 626.3176000695.

The spelling of 245687945 in words is "two hundred forty-five million, six hundred eighty-seven thousand, nine hundred forty-five".