51313249 has 4 divisors (see below), whose sum is σ = 55260436. Its totient is φ = 47366064.

The previous prime is 51313247. The next prime is 51313289. The reversal of 51313249 is 94231315.

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 32547025 + 18766224 = 5705^2 + 4332^2 .

It is a cyclic number.

It is not a de Polignac number, because 51313249 - 2¹ = 51313247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51313247) 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, 1973574 + ... + 1973599.

It is an arithmetic number, because the mean of its divisors is an integer number (13815109).

Almost surely, 2^51313249 is an apocalyptic number.

It is an amenable number.

51313249 is a deficient number, since it is larger than the sum of its proper divisors (3947187).

51313249 is a wasteful number, since it uses less digits than its factorization.

51313249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3947186.

The product of its digits is 3240, while the sum is 28.

The square root of 51313249 is about 7163.3266713169. The cubic root of 51313249 is about 371.6006838790.

The spelling of 51313249 in words is "fifty-one million, three hundred thirteen thousand, two hundred forty-nine".