51331403 has 4 divisors (see below), whose sum is σ = 51355200. Its totient is φ = 51307608.

The previous prime is 51331391. The next prime is 51331411. The reversal of 51331403 is 30413315.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51331403 - 2¹⁰ = 51330379 is a prime.

It is a super-3 number, since 3×51331403³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51331463) 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, 8300 + ... + 13097.

It is an arithmetic number, because the mean of its divisors is an integer number (12838800).

Almost surely, 2^51331403 is an apocalyptic number.

51331403 is a deficient number, since it is larger than the sum of its proper divisors (23797).

51331403 is a wasteful number, since it uses less digits than its factorization.

51331403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23796.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 51331403 is about 7164.5937079502. The cubic root of 51331403 is about 371.6445013046.

Adding to 51331403 its reverse (30413315), we get a palindrome (81744718).

The spelling of 51331403 in words is "fifty-one million, three hundred thirty-one thousand, four hundred three".