245677813 has 4 divisors (see below), whose sum is σ = 245998060. Its totient is φ = 245357568.

The previous prime is 245677807. The next prime is 245677823. The reversal of 245677813 is 318776542.

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 150381169 + 95296644 = 12263^2 + 9762^2 .

It is a cyclic number.

It is not a de Polignac number, because 245677813 - 2⁹ = 245677301 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 245677813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245677823) 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, 158970 + ... + 160507.

It is an arithmetic number, because the mean of its divisors is an integer number (61499515).

Almost surely, 2^245677813 is an apocalyptic number.

It is an amenable number.

245677813 is a deficient number, since it is larger than the sum of its proper divisors (320247).

245677813 is an equidigital number, since it uses as much as digits as its factorization.

245677813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320246.

The product of its digits is 282240, while the sum is 43.

The square root of 245677813 is about 15674.1128297585. The cubic root of 245677813 is about 626.3089903170.

The spelling of 245677813 in words is "two hundred forty-five million, six hundred seventy-seven thousand, eight hundred thirteen".