51976513 has 4 divisors (see below), whose sum is σ = 52019968. Its totient is φ = 51933060.

The previous prime is 51976493. The next prime is 51976537. The reversal of 51976513 is 31567915.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31567915 = 5 ⋅6313583.

It is a cyclic number.

It is not a de Polignac number, because 51976513 - 2¹⁷ = 51845441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51976543) 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, 19881 + ... + 22342.

It is an arithmetic number, because the mean of its divisors is an integer number (13004992).

Almost surely, 2^51976513 is an apocalyptic number.

It is an amenable number.

51976513 is a deficient number, since it is larger than the sum of its proper divisors (43455).

51976513 is a wasteful number, since it uses less digits than its factorization.

51976513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43454.

The product of its digits is 28350, while the sum is 37.

The square root of 51976513 is about 7209.4738365570. The cubic root of 51976513 is about 373.1949113923.

The spelling of 51976513 in words is "fifty-one million, nine hundred seventy-six thousand, five hundred thirteen".