51511013 has 4 divisors (see below), whose sum is σ = 52607040. Its totient is φ = 50414988.

The previous prime is 51510959. The next prime is 51511039. The reversal of 51511013 is 31011515.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51511013 - 2¹⁰ = 51509989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51510982 and 51511000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51511043) 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, 547943 + ... + 548036.

It is an arithmetic number, because the mean of its divisors is an integer number (13151760).

Almost surely, 2^51511013 is an apocalyptic number.

It is an amenable number.

51511013 is a deficient number, since it is larger than the sum of its proper divisors (1096027).

51511013 is a wasteful number, since it uses less digits than its factorization.

51511013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1096026.

The product of its (nonzero) digits is 75, while the sum is 17.

The square root of 51511013 is about 7177.1173182553. The cubic root of 51511013 is about 372.0774615158.

Adding to 51511013 its reverse (31011515), we get a palindrome (82522528).

The spelling of 51511013 in words is "fifty-one million, five hundred eleven thousand, thirteen".