126781097 has 2 divisors, whose sum is σ = 126781098. Its totient is φ = 126781096.

The previous prime is 126781093. The next prime is 126781099. The reversal of 126781097 is 790187621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84842521 + 41938576 = 9211^2 + 6476^2 .

It is a cyclic number.

It is not a de Polignac number, because 126781097 - 2² = 126781093 is a prime.

Together with 126781099, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (126781093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63390548 + 63390549.

It is an arithmetic number, because the mean of its divisors is an integer number (63390549).

Almost surely, 2^126781097 is an apocalyptic number.

It is an amenable number.

126781097 is a deficient number, since it is larger than the sum of its proper divisors (1).

126781097 is an equidigital number, since it uses as much as digits as its factorization.

126781097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 41.

The square root of 126781097 is about 11259.7112307554. The cubic root of 126781097 is about 502.3636051354.

The spelling of 126781097 in words is "one hundred twenty-six million, seven hundred eighty-one thousand, ninety-seven".