51330413 has 4 divisors (see below), whose sum is σ = 52200480. Its totient is φ = 50460348.

The previous prime is 51330403. The next prime is 51330421. The reversal of 51330413 is 31403315.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31403315 = 5 ⋅6280663.

It is a cyclic number.

It is not a de Polignac number, because 51330413 - 2¹⁰ = 51329389 is a prime.

It is a super-2 number, since 2×51330413² = 5269622597501138, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51330403) 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, 434945 + ... + 435062.

It is an arithmetic number, because the mean of its divisors is an integer number (13050120).

Almost surely, 2^51330413 is an apocalyptic number.

It is an amenable number.

51330413 is a deficient number, since it is larger than the sum of its proper divisors (870067).

51330413 is an equidigital number, since it uses as much as digits as its factorization.

51330413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870066.

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

The square root of 51330413 is about 7164.5246178654. The cubic root of 51330413 is about 371.6421120562.

Adding to 51330413 its reverse (31403315), we get a palindrome (82733728).

The spelling of 51330413 in words is "fifty-one million, three hundred thirty thousand, four hundred thirteen".