51240011 has 4 divisors (see below), whose sum is σ = 52330272. Its totient is φ = 50149752.

The previous prime is 51240001. The next prime is 51240019. The reversal of 51240011 is 11004215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11004215 = 5 ⋅2200843.

It is a de Polignac number, because none of the positive numbers 2^k-51240011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51240019) 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, 545060 + ... + 545153.

It is an arithmetic number, because the mean of its divisors is an integer number (13082568).

Almost surely, 2^51240011 is an apocalyptic number.

51240011 is a deficient number, since it is larger than the sum of its proper divisors (1090261).

51240011 is a wasteful number, since it uses less digits than its factorization.

51240011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090260.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 51240011 is about 7158.2128356176. The cubic root of 51240011 is about 371.4238078637.

Adding to 51240011 its reverse (11004215), we get a palindrome (62244226).

The spelling of 51240011 in words is "fifty-one million, two hundred forty thousand, eleven".