251201245105 has 16 divisors (see below), whose sum is σ = 305963005824. Its totient is φ = 197947094400.

The previous prime is 251201245091. The next prime is 251201245109. The reversal of 251201245105 is 501542102152.

It is not a de Polignac number, because 251201245105 - 2³⁵ = 216841506737 is a prime.

It is a super-2 number, since 2×251201245105² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251201245109) 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, 8628804 + ... + 8657866.

It is an arithmetic number, because the mean of its divisors is an integer number (19122687864).

Almost surely, 2^251201245105 is an apocalyptic number.

It is an amenable number.

251201245105 is a deficient number, since it is larger than the sum of its proper divisors (54761760719).

251201245105 is a wasteful number, since it uses less digits than its factorization.

251201245105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54936.

The product of its (nonzero) digits is 4000, while the sum is 28.

Adding to 251201245105 its reverse (501542102152), we get a palindrome (752743347257).

The spelling of 251201245105 in words is "two hundred fifty-one billion, two hundred one million, two hundred forty-five thousand, one hundred five".