2457781421 has 2 divisors, whose sum is σ = 2457781422. Its totient is φ = 2457781420.

The previous prime is 2457781303. The next prime is 2457781429. The reversal of 2457781421 is 1241877542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1593127396 + 864654025 = 39914^2 + 29405^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2457781421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2457781429) 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 as a sum of consecutive naturals, namely, 1228890710 + 1228890711.

It is an arithmetic number, because the mean of its divisors is an integer number (1228890711).

Almost surely, 2^2457781421 is an apocalyptic number.

It is an amenable number.

2457781421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2457781421 is an equidigital number, since it uses as much as digits as its factorization.

2457781421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 125440, while the sum is 41.

The square root of 2457781421 is about 49576.0165906863. The cubic root of 2457781421 is about 1349.5254703492.

The spelling of 2457781421 in words is "two billion, four hundred fifty-seven million, seven hundred eighty-one thousand, four hundred twenty-one".