51111353251 has 8 divisors (see below), whose sum is σ = 58414347360. Its totient is φ = 43808702208.

The previous prime is 51111353243. The next prime is 51111353263. The reversal of 51111353251 is 15235311115.

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 51111353251 - 2³ = 51111353243 is a prime.

It is a super-2 number, since 2×51111353251² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51111353201) 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, 502515 + ... + 595603.

It is an arithmetic number, because the mean of its divisors is an integer number (7301793420).

Almost surely, 2^51111353251 is an apocalyptic number.

51111353251 is a deficient number, since it is larger than the sum of its proper divisors (7302994109).

51111353251 is an equidigital number, since it uses as much as digits as its factorization.

51111353251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171533.

The product of its digits is 2250, while the sum is 28.

Adding to 51111353251 its reverse (15235311115), we get a palindrome (66346664366).

The spelling of 51111353251 in words is "fifty-one billion, one hundred eleven million, three hundred fifty-three thousand, two hundred fifty-one".