51244145 has 4 divisors (see below), whose sum is σ = 61492980. Its totient is φ = 40995312.

The previous prime is 51244139. The next prime is 51244183. The reversal of 51244145 is 54144215.

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 38291344 + 12952801 = 6188^2 + 3599^2 .

It is a cyclic number.

It is not a de Polignac number, because 51244145 - 2⁴ = 51244129 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5124410 + ... + 5124419.

It is an arithmetic number, because the mean of its divisors is an integer number (15373245).

Almost surely, 2^51244145 is an apocalyptic number.

It is an amenable number.

51244145 is a deficient number, since it is larger than the sum of its proper divisors (10248835).

51244145 is a wasteful number, since it uses less digits than its factorization.

51244145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10248834.

The product of its digits is 3200, while the sum is 26.

The square root of 51244145 is about 7158.5015890199. The cubic root of 51244145 is about 371.4337963128.

The spelling of 51244145 in words is "fifty-one million, two hundred forty-four thousand, one hundred forty-five".