125216101 has 8 divisors (see below), whose sum is σ = 132816024. Its totient is φ = 117642240.

The previous prime is 125216093. The next prime is 125216107. The reversal of 125216101 is 101612521.

It is a Cunningham number, because it is equal to 11190²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 76983076 + 48233025 = 8774^2 + 6945^2 .

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 125216101 - 2³ = 125216093 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125216107) 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, 3871 + ... + 16291.

It is an arithmetic number, because the mean of its divisors is an integer number (16602003).

Almost surely, 2^125216101 is an apocalyptic number.

It is an amenable number.

125216101 is a deficient number, since it is larger than the sum of its proper divisors (7599923).

125216101 is a wasteful number, since it uses less digits than its factorization.

125216101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13031.

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 125216101 is about 11190.0000446828. Note that the first 4 decimals coincide. The cubic root of 125216101 is about 500.2879687828.

Adding to 125216101 its reverse (101612521), we get a palindrome (226828622).

The spelling of 125216101 in words is "one hundred twenty-five million, two hundred sixteen thousand, one hundred one".