51353431 has 4 divisors (see below), whose sum is σ = 51852112. Its totient is φ = 50854752.

The previous prime is 51353429. The next prime is 51353437. The reversal of 51353431 is 13435315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13435315 = 5 ⋅2687063.

It is a cyclic number.

It is not a de Polignac number, because 51353431 - 2¹ = 51353429 is a prime.

It is a super-2 number, since 2×51353431² = 5274349750943522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51353396 and 51353405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51353437) 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, 249186 + ... + 249391.

It is an arithmetic number, because the mean of its divisors is an integer number (12963028).

Almost surely, 2^51353431 is an apocalyptic number.

51353431 is a deficient number, since it is larger than the sum of its proper divisors (498681).

51353431 is a wasteful number, since it uses less digits than its factorization.

51353431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498680.

The product of its digits is 2700, while the sum is 25.

The square root of 51353431 is about 7166.1308249292. The cubic root of 51353431 is about 371.6976553444.

Adding to 51353431 its reverse (13435315), we get a palindrome (64788746).

The spelling of 51353431 in words is "fifty-one million, three hundred fifty-three thousand, four hundred thirty-one".