126609257 has 4 divisors (see below), whose sum is σ = 127862916. Its totient is φ = 125355600.

The previous prime is 126609253. The next prime is 126609269. The reversal of 126609257 is 752906621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 752906621 = 101 ⋅7454521.

It can be written as a sum of positive squares in 2 ways, for example, as 53523856 + 73085401 = 7316^2 + 8549^2 .

It is a cyclic number.

It is not a de Polignac number, because 126609257 - 2² = 126609253 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 126609257.

It is not an unprimeable number, because it can be changed into a prime (126609253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 626678 + ... + 626879.

It is an arithmetic number, because the mean of its divisors is an integer number (31965729).

Almost surely, 2^126609257 is an apocalyptic number.

It is an amenable number.

126609257 is a deficient number, since it is larger than the sum of its proper divisors (1253659).

126609257 is a wasteful number, since it uses less digits than its factorization.

126609257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1253658.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 126609257 is about 11252.0778969931. The cubic root of 126609257 is about 502.1365334459.

The spelling of 126609257 in words is "one hundred twenty-six million, six hundred nine thousand, two hundred fifty-seven".