51121431 has 12 divisors (see below), whose sum is σ = 78185952. Its totient is φ = 32076096.

The previous prime is 51121429. The next prime is 51121439. The reversal of 51121431 is 13412115.

It is not a de Polignac number, because 51121431 - 2¹ = 51121429 is a prime.

It is a super-2 number, since 2×51121431² = 5226801414975522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51121439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 166911 + ... + 167216.

It is an arithmetic number, because the mean of its divisors is an integer number (6515496).

Almost surely, 2^51121431 is an apocalyptic number.

51121431 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

51121431 is a deficient number, since it is larger than the sum of its proper divisors (27064521).

51121431 is a wasteful number, since it uses less digits than its factorization.

51121431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334150 (or 334147 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 51121431 is about 7149.9252443644. The cubic root of 51121431 is about 371.1370693480.

Adding to 51121431 its reverse (13412115), we get a palindrome (64533546).

The spelling of 51121431 in words is "fifty-one million, one hundred twenty-one thousand, four hundred thirty-one".