649126837 has 2 divisors, whose sum is σ = 649126838. Its totient is φ = 649126836.

The previous prime is 649126787. The next prime is 649126867. The reversal of 649126837 is 738621946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 628705476 + 20421361 = 25074^2 + 4519^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649126837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649126867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324563418 + 324563419.

It is an arithmetic number, because the mean of its divisors is an integer number (324563419).

Almost surely, 2^649126837 is an apocalyptic number.

It is an amenable number.

649126837 is a deficient number, since it is larger than the sum of its proper divisors (1).

649126837 is an equidigital number, since it uses as much as digits as its factorization.

649126837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 46.

The square root of 649126837 is about 25477.9676779762. The cubic root of 649126837 is about 865.8510505346.

The spelling of 649126837 in words is "six hundred forty-nine million, one hundred twenty-six thousand, eight hundred thirty-seven".