51440311 has 8 divisors (see below), whose sum is σ = 55689984. Its totient is φ = 47232480.

The previous prime is 51440303. The next prime is 51440327. The reversal of 51440311 is 11304415.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51440311 - 2³ = 51440303 is a prime.

It is a super-2 number, since 2×51440311² = 5292211191553442, 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 (51440371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7876 + ... + 12841.

It is an arithmetic number, because the mean of its divisors is an integer number (6961248).

Almost surely, 2^51440311 is an apocalyptic number.

51440311 is a deficient number, since it is larger than the sum of its proper divisors (4249673).

51440311 is a wasteful number, since it uses less digits than its factorization.

51440311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20921.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 51440311 is about 7172.1901118138. The cubic root of 51440311 is about 371.9071505852.

Adding to 51440311 its reverse (11304415), we get a palindrome (62744726).

The spelling of 51440311 in words is "fifty-one million, four hundred forty thousand, three hundred eleven".