2520345997 has 4 divisors (see below), whose sum is σ = 2714218780. Its totient is φ = 2326473216.

The previous prime is 2520345943. The next prime is 2520346009. The reversal of 2520345997 is 7995430252.

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 1520142121 + 1000203876 = 38989^2 + 31626^2 .

It is a cyclic number.

It is not a de Polignac number, because 2520345997 - 2¹¹ = 2520343949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2520345937) 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, 96936372 + ... + 96936397.

It is an arithmetic number, because the mean of its divisors is an integer number (678554695).

Almost surely, 2^2520345997 is an apocalyptic number.

It is an amenable number.

2520345997 is a deficient number, since it is larger than the sum of its proper divisors (193872783).

2520345997 is a wasteful number, since it uses less digits than its factorization.

2520345997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193872782.

The product of its (nonzero) digits is 680400, while the sum is 46.

The square root of 2520345997 is about 50203.0476863706. The cubic root of 2520345997 is about 1360.8807006437.

The spelling of 2520345997 in words is "two billion, five hundred twenty million, three hundred forty-five thousand, nine hundred ninety-seven".