51240146 has 8 divisors (see below), whose sum is σ = 77160060. Its totient is φ = 25520128.

The previous prime is 51240121. The next prime is 51240221. The reversal of 51240146 is 64104215.

It can be written as a sum of positive squares in 2 ways, for example, as 47761921 + 3478225 = 6911^2 + 1865^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

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, 49331 + ... + 50358.

Almost surely, 2^51240146 is an apocalyptic number.

51240146 is a deficient number, since it is larger than the sum of its proper divisors (25919914).

51240146 is a wasteful number, since it uses less digits than its factorization.

51240146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99948.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 51240146 is about 7158.2222653393. Note that the first 4 decimals coincide. The cubic root of 51240146 is about 371.4241340552.

The spelling of 51240146 in words is "fifty-one million, two hundred forty thousand, one hundred forty-six".