51240013 has 8 divisors (see below), whose sum is σ = 57826080. Its totient is φ = 44975280.

The previous prime is 51240001. The next prime is 51240019. The reversal of 51240013 is 31004215.

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 51240013 - 2¹³ = 51231821 is a prime.

It is a Duffinian number.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 79995 + ... + 80632.

It is an arithmetic number, because the mean of its divisors is an integer number (7228260).

Almost surely, 2^51240013 is an apocalyptic number.

It is an amenable number.

51240013 is a deficient number, since it is larger than the sum of its proper divisors (6586067).

51240013 is a wasteful number, since it uses less digits than its factorization.

51240013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160667.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 51240013 is about 7158.2129753172. The cubic root of 51240013 is about 371.4238126961.

Adding to 51240013 its reverse (31004215), we get a palindrome (82244228).

The spelling of 51240013 in words is "fifty-one million, two hundred forty thousand, thirteen".