215225001 has 6 divisors (see below), whose sum is σ = 310880570. Its totient is φ = 143483328.

The previous prime is 215224991. The next prime is 215225029. The reversal of 215225001 is 100522512.

It can be written as a sum of positive squares in only one way, i.e., 206669376 + 8555625 = 14376^2 + 2925^2 .

It is not a de Polignac number, because 215225001 - 2⁶ = 215224937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (215225071) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11956936 + ... + 11956953.

Almost surely, 2^215225001 is an apocalyptic number.

It is an amenable number.

215225001 is a deficient number, since it is larger than the sum of its proper divisors (95655569).

215225001 is a wasteful number, since it uses less digits than its factorization.

215225001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23913895 (or 23913892 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 215225001 is about 14670.5487627423. The cubic root of 215225001 is about 599.2815483888.

Adding to 215225001 its reverse (100522512), we get a palindrome (315747513).

The spelling of 215225001 in words is "two hundred fifteen million, two hundred twenty-five thousand, one".