126252571 has 4 divisors (see below), whose sum is σ = 129331944. Its totient is φ = 123173200.

The previous prime is 126252569. The next prime is 126252583. The reversal of 126252571 is 175252621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 126252571 - 2¹ = 126252569 is a prime.

It is a super-2 number, since 2×126252571² = 31879423368220082, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126252871) 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, 1539625 + ... + 1539706.

It is an arithmetic number, because the mean of its divisors is an integer number (32332986).

Almost surely, 2^126252571 is an apocalyptic number.

126252571 is a deficient number, since it is larger than the sum of its proper divisors (3079373).

126252571 is an equidigital number, since it uses as much as digits as its factorization.

126252571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3079372.

The product of its digits is 8400, while the sum is 31.

The square root of 126252571 is about 11236.2169345381. The cubic root of 126252571 is about 501.6645470834.

Subtracting 126252571 from its reverse (175252621), we obtain a triangular number (49000050 = T₉₈₉₉).

The spelling of 126252571 in words is "one hundred twenty-six million, two hundred fifty-two thousand, five hundred seventy-one".