126513997 has 4 divisors (see below), whose sum is σ = 128115520. Its totient is φ = 124912476.

The previous prime is 126513953. The next prime is 126514001. The reversal of 126513997 is 799315621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 126513997 - 2²³ = 118125389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126513097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 800643 + ... + 800800.

It is an arithmetic number, because the mean of its divisors is an integer number (32028880).

Almost surely, 2^126513997 is an apocalyptic number.

It is an amenable number.

126513997 is a deficient number, since it is larger than the sum of its proper divisors (1601523).

126513997 is an equidigital number, since it uses as much as digits as its factorization.

126513997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1601522.

The product of its digits is 102060, while the sum is 43.

The square root of 126513997 is about 11247.8441045384. The cubic root of 126513997 is about 502.0105670701.

The spelling of 126513997 in words is "one hundred twenty-six million, five hundred thirteen thousand, nine hundred ninety-seven".