280137313 has 4 divisors (see below), whose sum is σ = 280198660. Its totient is φ = 280075968.

The previous prime is 280137301. The next prime is 280137317. The reversal of 280137313 is 313731082.

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 24681024 + 255456289 = 4968^2 + 15983^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280137313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280137317) 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, 23220 + ... + 33157.

It is an arithmetic number, because the mean of its divisors is an integer number (70049665).

Almost surely, 2^280137313 is an apocalyptic number.

It is an amenable number.

280137313 is a deficient number, since it is larger than the sum of its proper divisors (61347).

280137313 is an equidigital number, since it uses as much as digits as its factorization.

280137313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61346.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 280137313 is about 16737.3030384229. The cubic root of 280137313 is about 654.3201874008.

Adding to 280137313 its reverse (313731082), we get a palindrome (593868395).

The spelling of 280137313 in words is "two hundred eighty million, one hundred thirty-seven thousand, three hundred thirteen".