5137767821 has 2 divisors, whose sum is σ = 5137767822. Its totient is φ = 5137767820.

The previous prime is 5137767809. The next prime is 5137767841. The reversal of 5137767821 is 1287677315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4906302025 + 231465796 = 70045^2 + 15214^2 .

It is a cyclic number.

It is not a de Polignac number, because 5137767821 - 2⁶ = 5137767757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5137767841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2568883910 + 2568883911.

It is an arithmetic number, because the mean of its divisors is an integer number (2568883911).

Almost surely, 2^5137767821 is an apocalyptic number.

It is an amenable number.

5137767821 is a deficient number, since it is larger than the sum of its proper divisors (1).

5137767821 is an equidigital number, since it uses as much as digits as its factorization.

5137767821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 493920, while the sum is 47.

The square root of 5137767821 is about 71678.2241758262. The cubic root of 5137767821 is about 1725.5391798802.

The spelling of 5137767821 in words is "five billion, one hundred thirty-seven million, seven hundred sixty-seven thousand, eight hundred twenty-one".