51107431 has 4 divisors (see below), whose sum is σ = 51132664. Its totient is φ = 51082200.

The previous prime is 51107429. The next prime is 51107453. The reversal of 51107431 is 13470115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13470115 = 5 ⋅2694023.

It is a cyclic number.

It is not a de Polignac number, because 51107431 - 2¹ = 51107429 is a prime.

It is a super-2 number, since 2×51107431² = 5223939006839522, which 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 (51102431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9285 + ... + 13726.

It is an arithmetic number, because the mean of its divisors is an integer number (12783166).

Almost surely, 2^51107431 is an apocalyptic number.

51107431 is a deficient number, since it is larger than the sum of its proper divisors (25233).

51107431 is a wasteful number, since it uses less digits than its factorization.

51107431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25232.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 51107431 is about 7148.9461461113. The cubic root of 51107431 is about 371.1031866674.

Adding to 51107431 its reverse (13470115), we get a palindrome (64577546).

The spelling of 51107431 in words is "fifty-one million, one hundred seven thousand, four hundred thirty-one".