2520317647 has 4 divisors (see below), whose sum is σ = 2522763216. Its totient is φ = 2517872080.

The previous prime is 2520317617. The next prime is 2520317651. The reversal of 2520317647 is 7467130252.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2520317647 - 2³¹ = 372833999 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 (2520317617) 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, 1221238 + ... + 1223299.

It is an arithmetic number, because the mean of its divisors is an integer number (630690804).

Almost surely, 2^2520317647 is an apocalyptic number.

2520317647 is a deficient number, since it is larger than the sum of its proper divisors (2445569).

2520317647 is a wasteful number, since it uses less digits than its factorization.

2520317647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2445568.

The product of its (nonzero) digits is 70560, while the sum is 37.

The square root of 2520317647 is about 50202.7653322006. The cubic root of 2520317647 is about 1360.8755980225.

Adding to 2520317647 its reverse (7467130252), we get a palindrome (9987447899).

The spelling of 2520317647 in words is "two billion, five hundred twenty million, three hundred seventeen thousand, six hundred forty-seven".