126172001 has 4 divisors (see below), whose sum is σ = 126480900. Its totient is φ = 125863104.

The previous prime is 126171979. The next prime is 126172003. The reversal of 126172001 is 100271621.

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

It can be written as a sum of positive squares in 2 ways, for example, as 93624976 + 32547025 = 9676^2 + 5705^2 .

It is a cyclic number.

It is not a de Polignac number, because 126172001 - 2¹⁰ = 126170977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126172003) 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, 153836 + ... + 154653.

It is an arithmetic number, because the mean of its divisors is an integer number (31620225).

Almost surely, 2^126172001 is an apocalyptic number.

It is an amenable number.

126172001 is a deficient number, since it is larger than the sum of its proper divisors (308899).

126172001 is an equidigital number, since it uses as much as digits as its factorization.

126172001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308898.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 126172001 is about 11232.6310809178. The cubic root of 126172001 is about 501.5578094190.

The spelling of 126172001 in words is "one hundred twenty-six million, one hundred seventy-two thousand, one".