245822749 has 4 divisors (see below), whose sum is σ = 247096636. Its totient is φ = 244548864.

The previous prime is 245822747. The next prime is 245822761. The reversal of 245822749 is 947228542.

It is a happy number.

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 87516025 + 158306724 = 9355^2 + 12582^2 .

It is a cyclic number.

It is not a de Polignac number, because 245822749 - 2¹ = 245822747 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 (245822743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 636654 + ... + 637039.

It is an arithmetic number, because the mean of its divisors is an integer number (61774159).

Almost surely, 2^245822749 is an apocalyptic number.

It is an amenable number.

245822749 is a deficient number, since it is larger than the sum of its proper divisors (1273887).

245822749 is a wasteful number, since it uses less digits than its factorization.

245822749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1273886.

The product of its digits is 322560, while the sum is 43.

The square root of 245822749 is about 15678.7355676407. The cubic root of 245822749 is about 626.4321283868.

The spelling of 245822749 in words is "two hundred forty-five million, eight hundred twenty-two thousand, seven hundred forty-nine".