51153431 has 4 divisors (see below), whose sum is σ = 58461072. Its totient is φ = 43845792.

The previous prime is 51153407. The next prime is 51153433. The reversal of 51153431 is 13435115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13435115 = 5 ⋅2687023.

It is a cyclic number.

It is not a de Polignac number, because 51153431 - 2¹⁸ = 50891287 is a prime.

It is a super-2 number, since 2×51153431² = 5233347006143522, 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 = 51153397 and 51153406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51153433) 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 3 ways as a sum of consecutive naturals, for example, 3653810 + ... + 3653823.

It is an arithmetic number, because the mean of its divisors is an integer number (14615268).

Almost surely, 2^51153431 is an apocalyptic number.

51153431 is a deficient number, since it is larger than the sum of its proper divisors (7307641).

51153431 is an equidigital number, since it uses as much as digits as its factorization.

51153431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7307640.

The product of its digits is 900, while the sum is 23.

The square root of 51153431 is about 7152.1626799172. The cubic root of 51153431 is about 371.2144922526.

Adding to 51153431 its reverse (13435115), we get a palindrome (64588546).

The spelling of 51153431 in words is "fifty-one million, one hundred fifty-three thousand, four hundred thirty-one".