245131913 has 4 divisors (see below), whose sum is σ = 263988228. Its totient is φ = 226275600.

The previous prime is 245131879. The next prime is 245131927. The reversal of 245131913 is 319131542.

245131913 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, and also an emirpimes, since its reverse is a distinct semiprime: 319131542 = 2 ⋅159565771.

It can be written as a sum of positive squares in 2 ways, for example, as 12020089 + 233111824 = 3467^2 + 15268^2 .

It is a cyclic number.

It is not a de Polignac number, because 245131913 - 2¹⁰ = 245130889 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (245131213) 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, 9428138 + ... + 9428163.

It is an arithmetic number, because the mean of its divisors is an integer number (65997057).

Almost surely, 2^245131913 is an apocalyptic number.

It is an amenable number.

245131913 is a deficient number, since it is larger than the sum of its proper divisors (18856315).

245131913 is a wasteful number, since it uses less digits than its factorization.

245131913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18856314.

The product of its digits is 3240, while the sum is 29.

The square root of 245131913 is about 15656.6890816673. The cubic root of 245131913 is about 625.8447567964.

The spelling of 245131913 in words is "two hundred forty-five million, one hundred thirty-one thousand, nine hundred thirteen".