51274249 has 4 divisors (see below), whose sum is σ = 55218436. Its totient is φ = 47330064.

The previous prime is 51274247. The next prime is 51274253. The reversal of 51274249 is 94247215.

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 7118224 + 44156025 = 2668^2 + 6645^2 .

It is a cyclic number.

It is not a de Polignac number, because 51274249 - 2¹ = 51274247 is a prime.

It is a super-2 number, since 2×51274249² = 5258097221028002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51274241) 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, 1972074 + ... + 1972099.

It is an arithmetic number, because the mean of its divisors is an integer number (13804609).

Almost surely, 2^51274249 is an apocalyptic number.

It is an amenable number.

51274249 is a deficient number, since it is larger than the sum of its proper divisors (3944187).

51274249 is a wasteful number, since it uses less digits than its factorization.

51274249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3944186.

The product of its digits is 20160, while the sum is 34.

The square root of 51274249 is about 7160.6039549747. The cubic root of 51274249 is about 371.5065165174.

The spelling of 51274249 in words is "fifty-one million, two hundred seventy-four thousand, two hundred forty-nine".