51111213031 has 8 divisors (see below), whose sum is σ = 54128952864. Its totient is φ = 48094717440.

The previous prime is 51111213029. The next prime is 51111213047. The reversal of 51111213031 is 13031211115.

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 51111213031 - 2¹ = 51111213029 is a prime.

It is a super-2 number, since 2×51111213031² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51111213011) 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, 225810 + ... + 391423.

It is an arithmetic number, because the mean of its divisors is an integer number (6766119108).

Almost surely, 2^51111213031 is an apocalyptic number.

51111213031 is a deficient number, since it is larger than the sum of its proper divisors (3017739833).

51111213031 is a wasteful number, since it uses less digits than its factorization.

51111213031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622121.

The product of its (nonzero) digits is 90, while the sum is 19.

Adding to 51111213031 its reverse (13031211115), we get a palindrome (64142424146).

The spelling of 51111213031 in words is "fifty-one billion, one hundred eleven million, two hundred thirteen thousand, thirty-one".