125211001 has 8 divisors (see below), whose sum is σ = 132705000. Its totient is φ = 117731328.

The previous prime is 125210959. The next prime is 125211029. The reversal of 125211001 is 100112521.

It can be written as a sum of positive squares in 4 ways, for example, as 57395776 + 67815225 = 7576^2 + 8235^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 125211001 - 2¹¹ = 125208953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125211301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18285 + ... + 24181.

It is an arithmetic number, because the mean of its divisors is an integer number (16588125).

Almost surely, 2^125211001 is an apocalyptic number.

It is an amenable number.

125211001 is a deficient number, since it is larger than the sum of its proper divisors (7493999).

125211001 is a wasteful number, since it uses less digits than its factorization.

125211001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7163.

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 125211001 is about 11189.7721603257. The cubic root of 125211001 is about 500.2811765166.

Adding to 125211001 its reverse (100112521), we get a palindrome (225323522).

It can be divided in two parts, 12521 and 1001, that multiplied together give a palindrome (12533521).

The spelling of 125211001 in words is "one hundred twenty-five million, two hundred eleven thousand, one".