125001001 has 4 divisors (see below), whose sum is σ = 125187412. Its totient is φ = 124814592.

The previous prime is 125000963. The next prime is 125001013. The reversal of 125001001 is 100100521.

It is a happy number.

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 18498601 + 106502400 = 4301^2 + 10320^2 .

It is a cyclic number.

It is not a de Polignac number, because 125001001 - 2¹³ = 124992809 is a prime.

It is a Duffinian number.

125001001 is a modest number, since divided by 1001 gives 125 as remainder.

It is not an unprimeable number, because it can be changed into a prime (125101001) 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, 92196 + ... + 93541.

It is an arithmetic number, because the mean of its divisors is an integer number (31296853).

Almost surely, 2^125001001 is an apocalyptic number.

It is an amenable number.

125001001 is a deficient number, since it is larger than the sum of its proper divisors (186411).

125001001 is an equidigital number, since it uses as much as digits as its factorization.

125001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186410.

The product of its (nonzero) digits is 10, while the sum is 10.

The square root of 125001001 is about 11180.3846534902. The cubic root of 125001001 is about 500.0013346631.

Adding to 125001001 its reverse (100100521), we get a palindrome (225101522).

The spelling of 125001001 in words is "one hundred twenty-five million, one thousand, one".