51111213001 has 4 divisors (see below), whose sum is σ = 51727010832. Its totient is φ = 50495415172.

The previous prime is 51111212923. The next prime is 51111213011. The reversal of 51111213001 is 10031211115.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10031211115 = 5 ⋅2006242223.

It is a cyclic number.

It is not a de Polignac number, because 51111213001 - 2²³ = 51102824393 is a prime.

It is a super-3 number, since 3×51111213001³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51111213011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 307898791 + ... + 307898956.

It is an arithmetic number, because the mean of its divisors is an integer number (12931752708).

Almost surely, 2^51111213001 is an apocalyptic number.

It is an amenable number.

51111213001 is a deficient number, since it is larger than the sum of its proper divisors (615797831).

51111213001 is an equidigital number, since it uses as much as digits as its factorization.

51111213001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615797830.

The product of its (nonzero) digits is 30, while the sum is 16.

Adding to 51111213001 its reverse (10031211115), we get a palindrome (61142424116).

The spelling of 51111213001 in words is "fifty-one billion, one hundred eleven million, two hundred thirteen thousand, one".