251501122201 has 16 divisors (see below), whose sum is σ = 294580599808. Its totient is φ = 210225229200.

The previous prime is 251501122189. The next prime is 251501122241. The reversal of 251501122201 is 102221105152.

It is a happy number.

It is not a de Polignac number, because 251501122201 - 2¹⁷ = 251500991129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251501122241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 472155 + ... + 852016.

It is an arithmetic number, because the mean of its divisors is an integer number (18411287488).

Almost surely, 2^251501122201 is an apocalyptic number.

It is an amenable number.

251501122201 is a deficient number, since it is larger than the sum of its proper divisors (43079477607).

251501122201 is a wasteful number, since it uses less digits than its factorization.

251501122201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324852.

The product of its (nonzero) digits is 400, while the sum is 22.

Adding to 251501122201 its reverse (102221105152), we get a palindrome (353722227353).

The spelling of 251501122201 in words is "two hundred fifty-one billion, five hundred one million, one hundred twenty-two thousand, two hundred one".