126513617 has 2 divisors, whose sum is σ = 126513618. Its totient is φ = 126513616.

The previous prime is 126513587. The next prime is 126513713. The reversal of 126513617 is 716315621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77457601 + 49056016 = 8801^2 + 7004^2 .

It is a cyclic number.

It is not a de Polignac number, because 126513617 - 2¹² = 126509521 is a prime.

It is a Chen prime.

It is equal to p_7191392 and since 126513617 and 7191392 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (126513217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63256808 + 63256809.

It is an arithmetic number, because the mean of its divisors is an integer number (63256809).

Almost surely, 2^126513617 is an apocalyptic number.

It is an amenable number.

126513617 is a deficient number, since it is larger than the sum of its proper divisors (1).

126513617 is an equidigital number, since it uses as much as digits as its factorization.

126513617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 32.

The square root of 126513617 is about 11247.8272123997. The cubic root of 126513617 is about 502.0100644533.

The spelling of 126513617 in words is "one hundred twenty-six million, five hundred thirteen thousand, six hundred seventeen".