2623287721 has 2 divisors, whose sum is σ = 2623287722. Its totient is φ = 2623287720.

The previous prime is 2623287683. The next prime is 2623287761. The reversal of 2623287721 is 1277823262.

It is an a-pointer prime, because the next prime (2623287761) can be obtained adding 2623287721 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2492505625 + 130782096 = 49925^2 + 11436^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2623287721 is a prime.

It is not a weakly prime, because it can be changed into another prime (2623287761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1311643860 + 1311643861.

It is an arithmetic number, because the mean of its divisors is an integer number (1311643861).

Almost surely, 2^2623287721 is an apocalyptic number.

It is an amenable number.

2623287721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2623287721 is an equidigital number, since it uses as much as digits as its factorization.

2623287721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112896, while the sum is 40.

The square root of 2623287721 is about 51218.0409719075. The cubic root of 2623287721 is about 1379.1620833993.

The spelling of 2623287721 in words is "two billion, six hundred twenty-three million, two hundred eighty-seven thousand, seven hundred twenty-one".