2499139421 has 2 divisors, whose sum is σ = 2499139422. Its totient is φ = 2499139420.

The previous prime is 2499139411. The next prime is 2499139441. The reversal of 2499139421 is 1249319942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2434336921 + 64802500 = 49339^2 + 8050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2499139421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2499139411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1249569710 + 1249569711.

It is an arithmetic number, because the mean of its divisors is an integer number (1249569711).

Almost surely, 2^2499139421 is an apocalyptic number.

It is an amenable number.

2499139421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2499139421 is an equidigital number, since it uses as much as digits as its factorization.

2499139421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 44.

The square root of 2499139421 is about 49991.3934692763. The cubic root of 2499139421 is about 1357.0530590383.

The spelling of 2499139421 in words is "two billion, four hundred ninety-nine million, one hundred thirty-nine thousand, four hundred twenty-one".