51297013 has 4 divisors (see below), whose sum is σ = 51318540. Its totient is φ = 51275488.

The previous prime is 51297011. The next prime is 51297023. The reversal of 51297013 is 31079215.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46553329 + 4743684 = 6823^2 + 2178^2 .

It is a cyclic number.

It is not a de Polignac number, because 51297013 - 2¹ = 51297011 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 (51297011) 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, 6670 + ... + 12127.

It is an arithmetic number, because the mean of its divisors is an integer number (12829635).

Almost surely, 2^51297013 is an apocalyptic number.

It is an amenable number.

51297013 is a deficient number, since it is larger than the sum of its proper divisors (21527).

51297013 is a wasteful number, since it uses less digits than its factorization.

51297013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21526.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 51297013 is about 7162.1933093152. The cubic root of 51297013 is about 371.5614870811.

The spelling of 51297013 in words is "fifty-one million, two hundred ninety-seven thousand, thirteen".