51240511 has 8 divisors (see below), whose sum is σ = 61642880. Its totient is φ = 41608728.

The previous prime is 51240493. The next prime is 51240547. The reversal of 51240511 is 11504215.

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

It is not a de Polignac number, because 51240511 - 2⁷ = 51240383 is a prime.

It is a super-2 number, since 2×51240511² = 5251179935082242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51240571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192501 + ... + 192766.

It is an arithmetic number, because the mean of its divisors is an integer number (7705360).

Almost surely, 2^51240511 is an apocalyptic number.

51240511 is a deficient number, since it is larger than the sum of its proper divisors (10402369).

51240511 is a wasteful number, since it uses less digits than its factorization.

51240511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385293.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 51240511 is about 7158.2477604509. The cubic root of 51240511 is about 371.4250159775.

Adding to 51240511 its reverse (11504215), we get a palindrome (62744726).

The spelling of 51240511 in words is "fifty-one million, two hundred forty thousand, five hundred eleven".