2519673721 has 2 divisors, whose sum is σ = 2519673722. Its totient is φ = 2519673720.

The previous prime is 2519673701. The next prime is 2519673727. The reversal of 2519673721 is 1273769152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2310148096 + 209525625 = 48064^2 + 14475^2 .

It is a cyclic number.

It is not a de Polignac number, because 2519673721 - 2¹³ = 2519665529 is a prime.

It is not a weakly prime, because it can be changed into another prime (2519673727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1259836860 + 1259836861.

It is an arithmetic number, because the mean of its divisors is an integer number (1259836861).

Almost surely, 2^2519673721 is an apocalyptic number.

It is an amenable number.

2519673721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2519673721 is an equidigital number, since it uses as much as digits as its factorization.

2519673721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 158760, while the sum is 43.

The square root of 2519673721 is about 50196.3516702160. The cubic root of 2519673721 is about 1360.7596896406.

The spelling of 2519673721 in words is "two billion, five hundred nineteen million, six hundred seventy-three thousand, seven hundred twenty-one".