51420311 has 4 divisors (see below), whose sum is σ = 51875472. Its totient is φ = 50965152.

The previous prime is 51420307. The next prime is 51420319. The reversal of 51420311 is 11302415.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11302415 = 5 ⋅2260483.

It is a cyclic number.

It is not a de Polignac number, because 51420311 - 2² = 51420307 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51420311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51420319) 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, 227411 + ... + 227636.

It is an arithmetic number, because the mean of its divisors is an integer number (12968868).

Almost surely, 2^51420311 is an apocalyptic number.

51420311 is a deficient number, since it is larger than the sum of its proper divisors (455161).

51420311 is a wasteful number, since it uses less digits than its factorization.

51420311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455160.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 51420311 is about 7170.7957020124. The cubic root of 51420311 is about 371.8589451535.

Adding to 51420311 its reverse (11302415), we get a palindrome (62722726).

The spelling of 51420311 in words is "fifty-one million, four hundred twenty thousand, three hundred eleven".